/**
 * @output wp-admin/js/customize-controls.js
 */

/* global _wpCustomizeHeader, _wpCustomizeBackground, _wpMediaViewsL10n, MediaElementPlayer, console, confirm */
(function( exports, $ ){
	var Container, focus, normalizedTransitionendEventName, api = wp.customize;

	var reducedMotionMediaQuery = window.matchMedia( '(prefers-reduced-motion: reduce)' );
	var isReducedMotion = reducedMotionMediaQuery.matches;
	reducedMotionMediaQuery.addEventListener( 'change' , function handleReducedMotionChange( event ) {
		isReducedMotion = event.matches;
	});

	api.OverlayNotification = api.Notification.extend(/** @lends wp.customize.OverlayNotification.prototype */{

		/**
		 * Whether the notification should show a loading spinner.
		 *
		 * @since 4.9.0
		 * @var {boolean}
		 */
		loading: false,

		/**
		 * A notification that is displayed in a full-screen overlay.
		 *
		 * @constructs wp.customize.OverlayNotification
		 * @augments   wp.customize.Notification
		 *
		 * @since 4.9.0
		 *
		 * @param {string} code - Code.
		 * @param {Object} params - Params.
		 */
		initialize: function( code, params ) {
			var notification = this;
			api.Notification.prototype.initialize.call( notification, code, params );
			notification.containerClasses += ' notification-overlay';
			if ( notification.loading ) {
				notification.containerClasses += ' notification-loading';
			}
		},

		/**
		 * Render notification.
		 *
		 * @since 4.9.0
		 *
		 * @return {jQuery} Notification container.
		 */
		render: function() {
			var li = api.Notification.prototype.render.call( this );
			li.on( 'keydown', _.bind( this.handleEscape, this ) );
			return li;
		},

		/**
		 * Stop propagation on escape key presses, but also dismiss notification if it is dismissible.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		handleEscape: function( event ) {
			var notification = this;
			if ( 27 === event.which ) {
				event.stopPropagation();
				if ( notification.dismissible && notification.parent ) {
					notification.parent.remove( notification.code );
				}
			}
		}
	});

	api.Notifications = api.Values.extend(/** @lends wp.customize.Notifications.prototype */{

		/**
		 * Whether the alternative style should be used.
		 *
		 * @since 4.9.0
		 * @type {boolean}
		 */
		alt: false,

		/**
		 * The default constructor for items of the collection.
		 *
		 * @since 4.9.0
		 * @type {object}
		 */
		defaultConstructor: api.Notification,

		/**
		 * A collection of observable notifications.
		 *
		 * @since 4.9.0
		 *
		 * @constructs wp.customize.Notifications
		 * @augments   wp.customize.Values
		 *
		 * @param {Object}  options - Options.
		 * @param {jQuery}  [options.container] - Container element for notifications. This can be injected later.
		 * @param {boolean} [options.alt] - Whether alternative style should be used when rendering notifications.
		 *
		 * @return {void}
		 */
		initialize: function( options ) {
			var collection = this;

			api.Values.prototype.initialize.call( collection, options );

			_.bindAll( collection, 'constrainFocus' );

			// Keep track of the order in which the notifications were added for sorting purposes.
			collection._addedIncrement = 0;
			collection._addedOrder = {};

			// Trigger change event when notification is added or removed.
			collection.bind( 'add', function( notification ) {
				collection.trigger( 'change', notification );
			});
			collection.bind( 'removed', function( notification ) {
				collection.trigger( 'change', notification );
			});
		},

		/**
		 * Get the number of notifications added.
		 *
		 * @since 4.9.0
		 * @return {number} Count of notifications.
		 */
		count: function() {
			return _.size( this._value );
		},

		/**
		 * Add notification to the collection.
		 *
		 * @since 4.9.0
		 *
		 * @param {string|wp.customize.Notification} notification - Notification object to add. Alternatively code may be supplied, and in that case the second notificationObject argument must be supplied.
		 * @param {wp.customize.Notification} [notificationObject] - Notification to add when first argument is the code string.
		 * @return {wp.customize.Notification} Added notification (or existing instance if it was already added).
		 */
		add: function( notification, notificationObject ) {
			var collection = this, code, instance;
			if ( 'string' === typeof notification ) {
				code = notification;
				instance = notificationObject;
			} else {
				code = notification.code;
				instance = notification;
			}
			if ( ! collection.has( code ) ) {
				collection._addedIncrement += 1;
				collection._addedOrder[ code ] = collection._addedIncrement;
			}
			return api.Values.prototype.add.call( collection, code, instance );
		},

		/**
		 * Add notification to the collection.
		 *
		 * @since 4.9.0
		 * @param {string} code - Notification code to remove.
		 * @return {api.Notification} Added instance (or existing instance if it was already added).
		 */
		remove: function( code ) {
			var collection = this;
			delete collection._addedOrder[ code ];
			return api.Values.prototype.remove.call( this, code );
		},

		/**
		 * Get list of notifications.
		 *
		 * Notifications may be sorted by type followed by added time.
		 *
		 * @since 4.9.0
		 * @param {Object}  args - Args.
		 * @param {boolean} [args.sort=false] - Whether to return the notifications sorted.
		 * @return {Array.<wp.customize.Notification>} Notifications.
		 */
		get: function( args ) {
			var collection = this, notifications, errorTypePriorities, params;
			notifications = _.values( collection._value );

			params = _.extend(
				{ sort: false },
				args
			);

			if ( params.sort ) {
				errorTypePriorities = { error: 4, warning: 3, success: 2, info: 1 };
				notifications.sort( function( a, b ) {
					var aPriority = 0, bPriority = 0;
					if ( ! _.isUndefined( errorTypePriorities[ a.type ] ) ) {
						aPriority = errorTypePriorities[ a.type ];
					}
					if ( ! _.isUndefined( errorTypePriorities[ b.type ] ) ) {
						bPriority = errorTypePriorities[ b.type ];
					}
					if ( aPriority !== bPriority ) {
						return bPriority - aPriority; // Show errors first.
					}
					return collection._addedOrder[ b.code ] - collection._addedOrder[ a.code ]; // Show newer notifications higher.
				});
			}

			return notifications;
		},

		/**
		 * Render notifications area.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		render: function() {
			var collection = this,
				notifications, hadOverlayNotification = false, hasOverlayNotification, overlayNotifications = [],
				previousNotificationsByCode = {},
				listElement, focusableElements;

			// Short-circuit if there are no container to render into.
			if ( ! collection.container || ! collection.container.length ) {
				return;
			}

			notifications = collection.get( { sort: true } );
			collection.container.toggle( 0 !== notifications.length );

			// Short-circuit if there are no changes to the notifications.
			if ( collection.container.is( collection.previousContainer ) && _.isEqual( notifications, collection.previousNotifications ) ) {
				return;
			}

			// Make sure list is part of the container.
			listElement = collection.container.children( 'ul' ).first();
			if ( ! listElement.length ) {
				listElement = $( '<ul></ul>' );
				collection.container.append( listElement );
			}

			// Remove all notifications prior to re-rendering.
			listElement.find( '> [data-code]' ).remove();

			_.each( collection.previousNotifications, function( notification ) {
				previousNotificationsByCode[ notification.code ] = notification;
			});

			// Add all notifications in the sorted order.
			_.each( notifications, function( notification ) {
				var notificationContainer;
				if ( wp.a11y && ( ! previousNotificationsByCode[ notification.code ] || ! _.isEqual( notification.message, previousNotificationsByCode[ notification.code ].message ) ) ) {
					wp.a11y.speak( notification.message, 'assertive' );
				}
				notificationContainer = $( notification.render() );
				notification.container = notificationContainer;
				listElement.append( notificationContainer ); // @todo Consider slideDown() as enhancement.

				if ( notification.extended( api.OverlayNotification ) ) {
					overlayNotifications.push( notification );
				}
			});
			hasOverlayNotification = Boolean( overlayNotifications.length );

			if ( collection.previousNotifications ) {
				hadOverlayNotification = Boolean( _.find( collection.previousNotifications, function( notification ) {
					return notification.extended( api.OverlayNotification );
				} ) );
			}

			if ( hasOverlayNotification !== hadOverlayNotification ) {
				$( document.body ).toggleClass( 'customize-loading', hasOverlayNotification );
				collection.container.toggleClass( 'has-overlay-notifications', hasOverlayNotification );
				if ( hasOverlayNotification ) {
					collection.previousActiveElement = document.activeElement;
					$( document ).on( 'keydown', collection.constrainFocus );
				} else {
					$( document ).off( 'keydown', collection.constrainFocus );
				}
			}

			if ( hasOverlayNotification ) {
				collection.focusContainer = overlayNotifications[ overlayNotifications.length - 1 ].container;
				collection.focusContainer.prop( 'tabIndex', -1 );
				focusableElements = collection.focusContainer.find( ':focusable' );
				if ( focusableElements.length ) {
					focusableElements.first().focus();
				} else {
					collection.focusContainer.focus();
				}
			} else if ( collection.previousActiveElement ) {
				$( collection.previousActiveElement ).trigger( 'focus' );
				collection.previousActiveElement = null;
			}

			collection.previousNotifications = notifications;
			collection.previousContainer = collection.container;
			collection.trigger( 'rendered' );
		},

		/**
		 * Constrain focus on focus container.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		constrainFocus: function constrainFocus( event ) {
			var collection = this, focusableElements;

			// Prevent keys from escaping.
			event.stopPropagation();

			if ( 9 !== event.which ) { // Tab key.
				return;
			}

			focusableElements = collection.focusContainer.find( ':focusable' );
			if ( 0 === focusableElements.length ) {
				focusableElements = collection.focusContainer;
			}

			if ( ! $.contains( collection.focusContainer[0], event.target ) || ! $.contains( collection.focusContainer[0], document.activeElement ) ) {
				event.preventDefault();
				focusableElements.first().focus();
			} else if ( focusableElements.last().is( event.target ) && ! event.shiftKey ) {
				event.preventDefault();
				focusableElements.first().focus();
			} else if ( focusableElements.first().is( event.target ) && event.shiftKey ) {
				event.preventDefault();
				focusableElements.last().focus();
			}
		}
	});

	api.Setting = api.Value.extend(/** @lends wp.customize.Setting.prototype */{

		/**
		 * Default params.
		 *
		 * @since 4.9.0
		 * @var {object}
		 */
		defaults: {
			transport: 'refresh',
			dirty: false
		},

		/**
		 * A Customizer Setting.
		 *
		 * A setting is WordPress data (theme mod, option, menu, etc.) that the user can
		 * draft changes to in the Customizer.
		 *
		 * @see PHP class WP_Customize_Setting.
		 *
		 * @constructs wp.customize.Setting
		 * @augments   wp.customize.Value
		 *
		 * @since 3.4.0
		 *
		 * @param {string}  id                          - The setting ID.
		 * @param {*}       value                       - The initial value of the setting.
		 * @param {Object}  [options={}]                - Options.
		 * @param {string}  [options.transport=refresh] - The transport to use for previewing. Supports 'refresh' and 'postMessage'.
		 * @param {boolean} [options.dirty=false]       - Whether the setting should be considered initially dirty.
		 * @param {Object}  [options.previewer]         - The Previewer instance to sync with. Defaults to wp.customize.previewer.
		 */
		initialize: function( id, value, options ) {
			var setting = this, params;
			params = _.extend(
				{ previewer: api.previewer },
				setting.defaults,
				options || {}
			);

			api.Value.prototype.initialize.call( setting, value, params );

			setting.id = id;
			setting._dirty = params.dirty; // The _dirty property is what the Customizer reads from.
			setting.notifications = new api.Notifications();

			// Whenever the setting's value changes, refresh the preview.
			setting.bind( setting.preview );
		},

		/**
		 * Refresh the preview, respective of the setting's refresh policy.
		 *
		 * If the preview hasn't sent a keep-alive message and is likely
		 * disconnected by having navigated to a non-allowed URL, then the
		 * refresh transport will be forced when postMessage is the transport.
		 * Note that postMessage does not throw an error when the recipient window
		 * fails to match the origin window, so using try/catch around the
		 * previewer.send() call to then fallback to refresh will not work.
		 *
		 * @since 3.4.0
		 * @access public
		 *
		 * @return {void}
		 */
		preview: function() {
			var setting = this, transport;
			transport = setting.transport;

			if ( 'postMessage' === transport && ! api.state( 'previewerAlive' ).get() ) {
				transport = 'refresh';
			}

			if ( 'postMessage' === transport ) {
				setting.previewer.send( 'setting', [ setting.id, setting() ] );
			} else if ( 'refresh' === transport ) {
				setting.previewer.refresh();
			}
		},

		/**
		 * Find controls associated with this setting.
		 *
		 * @since 4.6.0
		 * @return {wp.customize.Control[]} Controls associated with setting.
		 */
		findControls: function() {
			var setting = this, controls = [];
			api.control.each( function( control ) {
				_.each( control.settings, function( controlSetting ) {
					if ( controlSetting.id === setting.id ) {
						controls.push( control );
					}
				} );
			} );
			return controls;
		}
	});

	/**
	 * Current change count.
	 *
	 * @alias wp.customize._latestRevision
	 *
	 * @since 4.7.0
	 * @type {number}
	 * @protected
	 */
	api._latestRevision = 0;

	/**
	 * Last revision that was saved.
	 *
	 * @alias wp.customize._lastSavedRevision
	 *
	 * @since 4.7.0
	 * @type {number}
	 * @protected
	 */
	api._lastSavedRevision = 0;

	/**
	 * Latest revisions associated with the updated setting.
	 *
	 * @alias wp.customize._latestSettingRevisions
	 *
	 * @since 4.7.0
	 * @type {object}
	 * @protected
	 */
	api._latestSettingRevisions = {};

	/*
	 * Keep track of the revision associated with each updated setting so that
	 * requestChangesetUpdate knows which dirty settings to include. Also, once
	 * ready is triggered and all initial settings have been added, increment
	 * revision for each newly-created initially-dirty setting so that it will
	 * also be included in changeset update requests.
	 */
	api.bind( 'change', function incrementChangedSettingRevision( setting ) {
		api._latestRevision += 1;
		api._latestSettingRevisions[ setting.id ] = api._latestRevision;
	} );
	api.bind( 'ready', function() {
		api.bind( 'add', function incrementCreatedSettingRevision( setting ) {
			if ( setting._dirty ) {
				api._latestRevision += 1;
				api._latestSettingRevisions[ setting.id ] = api._latestRevision;
			}
		} );
	} );

	/**
	 * Get the dirty setting values.
	 *
	 * @alias wp.customize.dirtyValues
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param {Object} [options] Options.
	 * @param {boolean} [options.unsaved=false] Whether only values not saved yet into a changeset will be returned (differential changes).
	 * @return {Object} Dirty setting values.
	 */
	api.dirtyValues = function dirtyValues( options ) {
		var values = {};
		api.each( function( setting ) {
			var settingRevision;

			if ( ! setting._dirty ) {
				return;
			}

			settingRevision = api._latestSettingRevisions[ setting.id ];

			// Skip including settings that have already been included in the changeset, if only requesting unsaved.
			if ( api.state( 'changesetStatus' ).get() && ( options && options.unsaved ) && ( _.isUndefined( settingRevision ) || settingRevision <= api._lastSavedRevision ) ) {
				return;
			}

			values[ setting.id ] = setting.get();
		} );
		return values;
	};

	/**
	 * Request updates to the changeset.
	 *
	 * @alias wp.customize.requestChangesetUpdate
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param {Object}  [changes] - Mapping of setting IDs to setting params each normally including a value property, or mapping to null.
	 *                             If not provided, then the changes will still be obtained from unsaved dirty settings.
	 * @param {Object}  [args] - Additional options for the save request.
	 * @param {boolean} [args.autosave=false] - Whether changes will be stored in autosave revision if the changeset has been promoted from an auto-draft.
	 * @param {boolean} [args.force=false] - Send request to update even when there are no changes to submit. This can be used to request the latest status of the changeset on the server.
	 * @param {string}  [args.title] - Title to update in the changeset. Optional.
	 * @param {string}  [args.date] - Date to update in the changeset. Optional.
	 * @return {jQuery.Promise} Promise resolving with the response data.
	 */
	api.requestChangesetUpdate = function requestChangesetUpdate( changes, args ) {
		var deferred, request, submittedChanges = {}, data, submittedArgs;
		deferred = new $.Deferred();

		// Prevent attempting changeset update while request is being made.
		if ( 0 !== api.state( 'processing' ).get() ) {
			deferred.reject( 'already_processing' );
			return deferred.promise();
		}

		submittedArgs = _.extend( {
			title: null,
			date: null,
			autosave: false,
			force: false
		}, args );

		if ( changes ) {
			_.extend( submittedChanges, changes );
		}

		// Ensure all revised settings (changes pending save) are also included, but not if marked for deletion in changes.
		_.each( api.dirtyValues( { unsaved: true } ), function( dirtyValue, settingId ) {
			if ( ! changes || null !== changes[ settingId ] ) {
				submittedChanges[ settingId ] = _.extend(
					{},
					submittedChanges[ settingId ] || {},
					{ value: dirtyValue }
				);
			}
		} );

		// Allow plugins to attach additional params to the settings.
		api.trigger( 'changeset-save', submittedChanges, submittedArgs );

		// Short-circuit when there are no pending changes.
		if ( ! submittedArgs.force && _.isEmpty( submittedChanges ) && null === submittedArgs.title && null === submittedArgs.date ) {
			deferred.resolve( {} );
			return deferred.promise();
		}

		// A status would cause a revision to be made, and for this wp.customize.previewer.save() should be used.
		// Status is also disallowed for revisions regardless.
		if ( submittedArgs.status ) {
			return deferred.reject( { code: 'illegal_status_in_changeset_update' } ).promise();
		}

		// Dates not beung allowed for revisions are is a technical limitation of post revisions.
		if ( submittedArgs.date && submittedArgs.autosave ) {
			return deferred.reject( { code: 'illegal_autosave_with_date_gmt' } ).promise();
		}

		// Make sure that publishing a changeset waits for all changeset update requests to complete.
		api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );
		deferred.always( function() {
			api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
		} );

		// Ensure that if any plugins add data to save requests by extending query() that they get included here.
		data = api.previewer.query( { excludeCustomizedSaved: true } );
		delete data.customized; // Being sent in customize_changeset_data instead.
		_.extend( data, {
			nonce: api.settings.nonce.save,
			customize_theme: api.settings.theme.stylesheet,
			customize_changeset_data: JSON.stringify( submittedChanges )
		} );
		if ( null !== submittedArgs.title ) {
			data.customize_changeset_title = submittedArgs.title;
		}
		if ( null !== submittedArgs.date ) {
			data.customize_changeset_date = submittedArgs.date;
		}
		if ( false !== submittedArgs.autosave ) {
			data.customize_changeset_autosave = 'true';
		}

		// Allow plugins to modify the params included with the save request.
		api.trigger( 'save-request-params', data );

		request = wp.ajax.post( 'customize_save', data );

		request.done( function requestChangesetUpdateDone( data ) {
			var savedChangesetValues = {};

			// Ensure that all settings updated subsequently will be included in the next changeset update request.
			api._lastSavedRevision = Math.max( api._latestRevision, api._lastSavedRevision );

			api.state( 'changesetStatus' ).set( data.changeset_status );

			if ( data.changeset_date ) {
				api.state( 'changesetDate' ).set( data.changeset_date );
			}

			deferred.resolve( data );
			api.trigger( 'changeset-saved', data );

			if ( data.setting_validities ) {
				_.each( data.setting_validities, function( validity, settingId ) {
					if ( true === validity && _.isObject( submittedChanges[ settingId ] ) && ! _.isUndefined( submittedChanges[ settingId ].value ) ) {
						savedChangesetValues[ settingId ] = submittedChanges[ settingId ].value;
					}
				} );
			}

			api.previewer.send( 'changeset-saved', _.extend( {}, data, { saved_changeset_values: savedChangesetValues } ) );
		} );
		request.fail( function requestChangesetUpdateFail( data ) {
			deferred.reject( data );
			api.trigger( 'changeset-error', data );
		} );
		request.always( function( data ) {
			if ( data.setting_validities ) {
				api._handleSettingValidities( {
					settingValidities: data.setting_validities
				} );
			}
		} );

		return deferred.promise();
	};

	/**
	 * Watch all changes to Value properties, and bubble changes to parent Values instance
	 *
	 * @alias wp.customize.utils.bubbleChildValueChanges
	 *
	 * @since 4.1.0
	 *
	 * @param {wp.customize.Class} instance
	 * @param {Array}              properties  The names of the Value instances to watch.
	 */
	api.utils.bubbleChildValueChanges = function ( instance, properties ) {
		$.each( properties, function ( i, key ) {
			instance[ key ].bind( function ( to, from ) {
				if ( instance.parent && to !== from ) {
					instance.parent.trigger( 'change', instance );
				}
			} );
		} );
	};

	/**
	 * Expand a panel, section, or control and focus on the first focusable element.
	 *
	 * @alias wp.customize~focus
	 *
	 * @since 4.1.0
	 *
	 * @param {Object}   [params]
	 * @param {Function} [params.completeCallback]
	 */
	focus = function ( params ) {
		var construct, completeCallback, focus, focusElement, sections;
		construct = this;
		params = params || {};
		focus = function () {
			// If a child section is currently expanded, collapse it.
			if ( construct.extended( api.Panel ) ) {
				sections = construct.sections();
				if ( 1 < sections.length ) {
					sections.forEach( function ( section ) {
						if ( section.expanded() ) {
							section.collapse();
						}
					} );
				}
			}

			var focusContainer;
			if ( ( construct.extended( api.Panel ) || construct.extended( api.Section ) ) && construct.expanded && construct.expanded() ) {
				focusContainer = construct.contentContainer;
			} else {
				focusContainer = construct.container;
			}

			focusElement = focusContainer.find( '.control-focus:first' );
			if ( 0 === focusElement.length ) {
				// Note that we can't use :focusable due to a jQuery UI issue. See: https://github.com/jquery/jquery-ui/pull/1583
				focusElement = focusContainer.find( 'input, select, textarea, button, object, a[href], [tabindex]' ).filter( ':visible' ).first();
			}
			focusElement.focus();
		};
		if ( params.completeCallback ) {
			completeCallback = params.completeCallback;
			params.completeCallback = function () {
				focus();
				completeCallback();
			};
		} else {
			params.completeCallback = focus;
		}

		api.state( 'paneVisible' ).set( true );
		if ( construct.expand ) {
			construct.expand( params );
		} else {
			params.completeCallback();
		}
	};

	/**
	 * Stable sort for Panels, Sections, and Controls.
	 *
	 * If a.priority() === b.priority(), then sort by their respective params.instanceNumber.
	 *
	 * @alias wp.customize.utils.prioritySort
	 *
	 * @since 4.1.0
	 *
	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} a
	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} b
	 * @return {number}
	 */
	api.utils.prioritySort = function ( a, b ) {
		if ( a.priority() === b.priority() && typeof a.params.instanceNumber === 'number' && typeof b.params.instanceNumber === 'number' ) {
			return a.params.instanceNumber - b.params.instanceNumber;
		} else {
			return a.priority() - b.priority();
		}
	};

	/**
	 * Return whether the supplied Event object is for a keydown event but not the Enter key.
	 *
	 * @alias wp.customize.utils.isKeydownButNotEnterEvent
	 *
	 * @since 4.1.0
	 *
	 * @param {jQuery.Event} event
	 * @return {boolean}
	 */
	api.utils.isKeydownButNotEnterEvent = function ( event ) {
		return ( 'keydown' === event.type && 13 !== event.which );
	};

	/**
	 * Return whether the two lists of elements are the same and are in the same order.
	 *
	 * @alias wp.customize.utils.areElementListsEqual
	 *
	 * @since 4.1.0
	 *
	 * @param {Array|jQuery} listA
	 * @param {Array|jQuery} listB
	 * @return {boolean}
	 */
	api.utils.areElementListsEqual = function ( listA, listB ) {
		var equal = (
			listA.length === listB.length && // If lists are different lengths, then naturally they are not equal.
			-1 === _.indexOf( _.map(         // Are there any false values in the list returned by map?
				_.zip( listA, listB ),       // Pair up each element between the two lists.
				function ( pair ) {
					return $( pair[0] ).is( pair[1] ); // Compare to see if each pair is equal.
				}
			), false ) // Check for presence of false in map's return value.
		);
		return equal;
	};

	/**
	 * Highlight the existence of a button.
	 *
	 * This function reminds the user of a button represented by the specified
	 * UI element, after an optional delay. If the user focuses the element
	 * before the delay passes, the reminder is canceled.
	 *
	 * @alias wp.customize.utils.highlightButton
	 *
	 * @since 4.9.0
	 *
	 * @param {jQuery} button - The element to highlight.
	 * @param {Object} [options] - Options.
	 * @param {number} [options.delay=0] - Delay in milliseconds.
	 * @param {jQuery} [options.focusTarget] - A target for user focus that defaults to the highlighted element.
	 *                                         If the user focuses the target before the delay passes, the reminder
	 *                                         is canceled. This option exists to accommodate compound buttons
	 *                                         containing auxiliary UI, such as the Publish button augmented with a
	 *                                         Settings button.
	 * @return {Function} An idempotent function that cancels the reminder.
	 */
	api.utils.highlightButton = function highlightButton( button, options ) {
		var animationClass = 'button-see-me',
			canceled = false,
			params;

		params = _.extend(
			{
				delay: 0,
				focusTarget: button
			},
			options
		);

		function cancelReminder() {
			canceled = true;
		}

		params.focusTarget.on( 'focusin', cancelReminder );
		setTimeout( function() {
			params.focusTarget.off( 'focusin', cancelReminder );

			if ( ! canceled ) {
				button.addClass( animationClass );
				button.one( 'animationend', function() {
					/*
					 * Remove animation class to avoid situations in Customizer where
					 * DOM nodes are moved (re-inserted) and the animation repeats.
					 */
					button.removeClass( animationClass );
				} );
			}
		}, params.delay );

		return cancelReminder;
	};

	/**
	 * Get current timestamp adjusted for server clock time.
	 *
	 * Same functionality as the `current_time( 'mysql', false )` function in PHP.
	 *
	 * @alias wp.customize.utils.getCurrentTimestamp
	 *
	 * @since 4.9.0
	 *
	 * @return {number} Current timestamp.
	 */
	api.utils.getCurrentTimestamp = function getCurrentTimestamp() {
		var currentDate, currentClientTimestamp, timestampDifferential;
		currentClientTimestamp = _.now();
		currentDate = new Date( api.settings.initialServerDate.replace( /-/g, '/' ) );
		timestampDifferential = currentClientTimestamp - api.settings.initialClientTimestamp;
		timestampDifferential += api.settings.initialClientTimestamp - api.settings.initialServerTimestamp;
		currentDate.setTime( currentDate.getTime() + timestampDifferential );
		return currentDate.getTime();
	};

	/**
	 * Get remaining time of when the date is set.
	 *
	 * @alias wp.customize.utils.getRemainingTime
	 *
	 * @since 4.9.0
	 *
	 * @param {string|number|Date} datetime - Date time or timestamp of the future date.
	 * @return {number} remainingTime - Remaining time in milliseconds.
	 */
	api.utils.getRemainingTime = function getRemainingTime( datetime ) {
		var millisecondsDivider = 1000, remainingTime, timestamp;
		if ( datetime instanceof Date ) {
			timestamp = datetime.getTime();
		} else if ( 'string' === typeof datetime ) {
			timestamp = ( new Date( datetime.replace( /-/g, '/' ) ) ).getTime();
		} else {
			timestamp = datetime;
		}

		remainingTime = timestamp - api.utils.getCurrentTimestamp();
		remainingTime = Math.ceil( remainingTime / millisecondsDivider );
		return remainingTime;
	};

	/**
	 * Return browser supported `transitionend` event name.
	 *
	 * @since 4.7.0
	 *
	 * @ignore
	 *
	 * @return {string|null} Normalized `transitionend` event name or null if CSS transitions are not supported.
	 */
	normalizedTransitionendEventName = (function () {
		var el, transitions, prop;
		el = document.createElement( 'div' );
		transitions = {
			'transition'      : 'transitionend',
			'OTransition'     : 'oTransitionEnd',
			'MozTransition'   : 'transitionend',
			'WebkitTransition': 'webkitTransitionEnd'
		};
		prop = _.find( _.keys( transitions ), function( prop ) {
			return ! _.isUndefined( el.style[ prop ] );
		} );
		if ( prop ) {
			return transitions[ prop ];
		} else {
			return null;
		}
	})();

	Container = api.Class.extend(/** @lends wp.customize~Container.prototype */{
		defaultActiveArguments: { duration: 'fast', completeCallback: $.noop },
		defaultExpandedArguments: { duration: 'fast', completeCallback: $.noop },
		containerType: 'container',
		defaults: {
			title: '',
			description: '',
			priority: 100,
			type: 'default',
			content: null,
			active: true,
			instanceNumber: null
		},

		/**
		 * Base class for Panel and Section.
		 *
		 * @constructs wp.customize~Container
		 * @augments   wp.customize.Class
		 *
		 * @since 4.1.0
		 *
		 * @borrows wp.customize~focus as focus
		 *
		 * @param {string}  id - The ID for the container.
		 * @param {Object}  options - Object containing one property: params.
		 * @param {string}  options.title - Title shown when panel is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the panel.
		 * @param {number}  [options.priority=100] - The sort priority for the panel.
		 * @param {string}  [options.templateId] - Template selector for container.
		 * @param {string}  [options.type=default] - The type of the panel. See wp.customize.panelConstructor.
		 * @param {string}  [options.content] - The markup to be used for the panel container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the panel is active or not.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var container = this;
			container.id = id;

			if ( ! Container.instanceCounter ) {
				Container.instanceCounter = 0;
			}
			Container.instanceCounter++;

			$.extend( container, {
				params: _.defaults(
					options.params || options, // Passing the params is deprecated.
					container.defaults
				)
			} );
			if ( ! container.params.instanceNumber ) {
				container.params.instanceNumber = Container.instanceCounter;
			}
			container.notifications = new api.Notifications();
			container.templateSelector = container.params.templateId || 'customize-' + container.containerType + '-' + container.params.type;
			container.container = $( container.params.content );
			if ( 0 === container.container.length ) {
				container.container = $( container.getContainer() );
			}
			container.headContainer = container.container;
			container.contentContainer = container.getContent();
			container.container = container.container.add( container.contentContainer );

			container.deferred = {
				embedded: new $.Deferred()
			};
			container.priority = new api.Value();
			container.active = new api.Value();
			container.activeArgumentsQueue = [];
			container.expanded = new api.Value();
			container.expandedArgumentsQueue = [];

			container.active.bind( function ( active ) {
				var args = container.activeArgumentsQueue.shift();
				args = $.extend( {}, container.defaultActiveArguments, args );
				active = ( active && container.isContextuallyActive() );
				container.onChangeActive( active, args );
			});
			container.expanded.bind( function ( expanded ) {
				var args = container.expandedArgumentsQueue.shift();
				args = $.extend( {}, container.defaultExpandedArguments, args );
				container.onChangeExpanded( expanded, args );
			});

			container.deferred.embedded.done( function () {
				container.setupNotifications();
				container.attachEvents();
			});

			api.utils.bubbleChildValueChanges( container, [ 'priority', 'active' ] );

			container.priority.set( container.params.priority );
			container.active.set( container.params.active );
			container.expanded.set( false );
		},

		/**
		 * Get the element that will contain the notifications.
		 *
		 * @since 4.9.0
		 * @return {jQuery} Notification container element.
		 */
		getNotificationsContainerElement: function() {
			var container = this;
			return container.contentContainer.find( '.customize-control-notifications-container:first' );
		},

		/**
		 * Set up notifications.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		setupNotifications: function() {
			var container = this, renderNotifications;
			container.notifications.container = container.getNotificationsContainerElement();

			// Render notifications when they change and when the construct is expanded.
			renderNotifications = function() {
				if ( container.expanded.get() ) {
					container.notifications.render();
				}
			};
			container.expanded.bind( renderNotifications );
			renderNotifications();
			container.notifications.bind( 'change', _.debounce( renderNotifications ) );
		},

		/**
		 * @since 4.1.0
		 *
		 * @abstract
		 */
		ready: function() {},

		/**
		 * Get the child models associated with this parent, sorting them by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @param {string} parentType
		 * @param {string} childType
		 * @return {Array}
		 */
		_children: function ( parentType, childType ) {
			var parent = this,
				children = [];
			api[ childType ].each( function ( child ) {
				if ( child[ parentType ].get() === parent.id ) {
					children.push( child );
				}
			} );
			children.sort( api.utils.prioritySort );
			return children;
		},

		/**
		 * To override by subclass, to return whether the container has active children.
		 *
		 * @since 4.1.0
		 *
		 * @abstract
		 */
		isContextuallyActive: function () {
			throw new Error( 'Container.isContextuallyActive() must be overridden in a subclass.' );
		},

		/**
		 * Active state change handler.
		 *
		 * Shows the container if it is active, hides it if not.
		 *
		 * To override by subclass, update the container's UI to reflect the provided active state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  active - The active state to transiution to.
		 * @param {Object}   [args] - Args.
		 * @param {Object}   [args.duration] - The duration for the slideUp/slideDown animation.
		 * @param {boolean}  [args.unchanged] - Whether the state is already known to not be changed, and so short-circuit with calling completeCallback early.
		 * @param {Function} [args.completeCallback] - Function to call when the slideUp/slideDown has completed.
		 */
		onChangeActive: function( active, args ) {
			var construct = this,
				headContainer = construct.headContainer,
				duration, expandedOtherPanel;

			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			duration = ( 'resolved' === api.previewer.deferred.active.state() ? args.duration : 0 );

			if ( construct.extended( api.Panel ) ) {
				// If this is a panel is not currently expanded but another panel is expanded, do not animate.
				api.panel.each(function ( panel ) {
					if ( panel !== construct && panel.expanded() ) {
						expandedOtherPanel = panel;
						duration = 0;
					}
				});

				// Collapse any expanded sections inside of this panel first before deactivating.
				if ( ! active ) {
					_.each( construct.sections(), function( section ) {
						section.collapse( { duration: 0 } );
					} );
				}
			}

			if ( ! $.contains( document, headContainer.get( 0 ) ) ) {
				// If the element is not in the DOM, then jQuery.fn.slideUp() does nothing.
				// In this case, a hard toggle is required instead.
				headContainer.toggle( active );
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			} else if ( active ) {
				headContainer.slideDown( duration, args.completeCallback );
			} else {
				if ( construct.expanded() ) {
					construct.collapse({
						duration: duration,
						completeCallback: function() {
							headContainer.slideUp( duration, args.completeCallback );
						}
					});
				} else {
					headContainer.slideUp( duration, args.completeCallback );
				}
			}
		},

		/**
		 * @since 4.1.0
		 *
		 * @param {boolean} active
		 * @param {Object}  [params]
		 * @return {boolean} False if state already applied.
		 */
		_toggleActive: function ( active, params ) {
			var self = this;
			params = params || {};
			if ( ( active && this.active.get() ) || ( ! active && ! this.active.get() ) ) {
				params.unchanged = true;
				self.onChangeActive( self.active.get(), params );
				return false;
			} else {
				params.unchanged = false;
				this.activeArgumentsQueue.push( params );
				this.active.set( active );
				return true;
			}
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already active.
		 */
		activate: function ( params ) {
			return this._toggleActive( true, params );
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already inactive.
		 */
		deactivate: function ( params ) {
			return this._toggleActive( false, params );
		},

		/**
		 * To override by subclass, update the container's UI to reflect the provided active state.
		 * @abstract
		 */
		onChangeExpanded: function () {
			throw new Error( 'Must override with subclass.' );
		},

		/**
		 * Handle the toggle logic for expand/collapse.
		 *
		 * @param {boolean}  expanded - The new state to apply.
		 * @param {Object}   [params] - Object containing options for expand/collapse.
		 * @param {Function} [params.completeCallback] - Function to call when expansion/collapse is complete.
		 * @return {boolean} False if state already applied or active state is false.
		 */
		_toggleExpanded: function( expanded, params ) {
			var instance = this, previousCompleteCallback;
			params = params || {};
			previousCompleteCallback = params.completeCallback;

			// Short-circuit expand() if the instance is not active.
			if ( expanded && ! instance.active() ) {
				return false;
			}

			api.state( 'paneVisible' ).set( true );
			params.completeCallback = function() {
				if ( previousCompleteCallback ) {
					previousCompleteCallback.apply( instance, arguments );
				}
				if ( expanded ) {
					instance.container.trigger( 'expanded' );
				} else {
					instance.container.trigger( 'collapsed' );
				}
			};
			if ( ( expanded && instance.expanded.get() ) || ( ! expanded && ! instance.expanded.get() ) ) {
				params.unchanged = true;
				instance.onChangeExpanded( instance.expanded.get(), params );
				return false;
			} else {
				params.unchanged = false;
				instance.expandedArgumentsQueue.push( params );
				instance.expanded.set( expanded );
				return true;
			}
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already expanded or if inactive.
		 */
		expand: function ( params ) {
			return this._toggleExpanded( true, params );
		},

		/**
		 * @param {Object} [params]
		 * @return {boolean} False if already collapsed.
		 */
		collapse: function ( params ) {
			return this._toggleExpanded( false, params );
		},

		/**
		 * Animate container state change if transitions are supported by the browser.
		 *
		 * @since 4.7.0
		 * @private
		 *
		 * @param {function} completeCallback Function to be called after transition is completed.
		 * @return {void}
		 */
		_animateChangeExpanded: function( completeCallback ) {
			// Return if CSS transitions are not supported or if reduced motion is enabled.
			if ( ! normalizedTransitionendEventName || isReducedMotion ) {
				// Schedule the callback until the next tick to prevent focus loss.
				_.defer( function () {
					if ( completeCallback ) {
						completeCallback();
					}
				} );
				return;
			}

			var construct = this,
				content = construct.contentContainer,
				overlay = content.closest( '.wp-full-overlay' ),
				elements, transitionEndCallback, transitionParentPane;

			// Determine set of elements that are affected by the animation.
			elements = overlay.add( content );

			if ( ! construct.panel || '' === construct.panel() ) {
				transitionParentPane = true;
			} else if ( api.panel( construct.panel() ).contentContainer.hasClass( 'skip-transition' ) ) {
				transitionParentPane = true;
			} else {
				transitionParentPane = false;
			}
			if ( transitionParentPane ) {
				elements = elements.add( '#customize-info, .customize-pane-parent' );
			}

			// Handle `transitionEnd` event.
			transitionEndCallback = function( e ) {
				if ( 2 !== e.eventPhase || ! $( e.target ).is( content ) ) {
					return;
				}
				content.off( normalizedTransitionendEventName, transitionEndCallback );
				elements.removeClass( 'busy' );
				if ( completeCallback ) {
					completeCallback();
				}
			};
			content.on( normalizedTransitionendEventName, transitionEndCallback );
			elements.addClass( 'busy' );

			// Prevent screen flicker when pane has been scrolled before expanding.
			_.defer( function() {
				var container = content.closest( '.wp-full-overlay-sidebar-content' ),
					currentScrollTop = container.scrollTop(),
					previousScrollTop = content.data( 'previous-scrollTop' ) || 0,
					expanded = construct.expanded();

				if ( expanded && 0 < currentScrollTop ) {
					content.css( 'top', currentScrollTop + 'px' );
					content.data( 'previous-scrollTop', currentScrollTop );
				} else if ( ! expanded && 0 < currentScrollTop + previousScrollTop ) {
					content.css( 'top', previousScrollTop - currentScrollTop + 'px' );
					container.scrollTop( previousScrollTop );
				}
			} );
		},

		/*
		 * is documented using @borrows in the constructor.
		 */
		focus: focus,

		/**
		 * Return the container html, generated from its JS template, if it exists.
		 *
		 * @since 4.3.0
		 */
		getContainer: function () {
			var template,
				container = this;

			if ( 0 !== $( '#tmpl-' + container.templateSelector ).length ) {
				template = wp.template( container.templateSelector );
			} else {
				template = wp.template( 'customize-' + container.containerType + '-default' );
			}
			if ( template && container.container ) {
				return template( _.extend(
					{ id: container.id },
					container.params
				) ).toString().trim();
			}

			return '<li></li>';
		},

		/**
		 * Find content element which is displayed when the section is expanded.
		 *
		 * After a construct is initialized, the return value will be available via the `contentContainer` property.
		 * By default the element will be related it to the parent container with `aria-owns` and detached.
		 * Custom panels and sections (such as the `NewMenuSection`) that do not have a sliding pane should
		 * just return the content element without needing to add the `aria-owns` element or detach it from
		 * the container. Such non-sliding pane custom sections also need to override the `onChangeExpanded`
		 * method to handle animating the panel/section into and out of view.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {jQuery} Detached content element.
		 */
		getContent: function() {
			var construct = this,
				container = construct.container,
				content = container.find( '.accordion-section-content, .control-panel-content' ).first(),
				contentId = 'sub-' + container.attr( 'id' ),
				ownedElements = contentId,
				alreadyOwnedElements = container.attr( 'aria-owns' );

			if ( alreadyOwnedElements ) {
				ownedElements = ownedElements + ' ' + alreadyOwnedElements;
			}
			container.attr( 'aria-owns', ownedElements );

			return content.detach().attr( {
				'id': contentId,
				'class': 'customize-pane-child ' + content.attr( 'class' ) + ' ' + container.attr( 'class' )
			} );
		}
	});

	api.Section = Container.extend(/** @lends wp.customize.Section.prototype */{
		containerType: 'section',
		containerParent: '#customize-theme-controls',
		containerPaneParent: '.customize-pane-parent',
		defaults: {
			title: '',
			description: '',
			priority: 100,
			type: 'default',
			content: null,
			active: true,
			instanceNumber: null,
			panel: null,
			customizeAction: ''
		},

		/**
		 * @constructs wp.customize.Section
		 * @augments   wp.customize~Container
		 *
		 * @since 4.1.0
		 *
		 * @param {string}  id - The ID for the section.
		 * @param {Object}  options - Options.
		 * @param {string}  options.title - Title shown when section is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the section.
		 * @param {number}  [options.priority=100] - The sort priority for the section.
		 * @param {string}  [options.type=default] - The type of the section. See wp.customize.sectionConstructor.
		 * @param {string}  [options.content] - The markup to be used for the section container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the section is active or not.
		 * @param {string}  options.panel - The ID for the panel this section is associated with.
		 * @param {string}  [options.customizeAction] - Additional context information shown before the section title when expanded.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var section = this, params;
			params = options.params || options;

			// Look up the type if one was not supplied.
			if ( ! params.type ) {
				_.find( api.sectionConstructor, function( Constructor, type ) {
					if ( Constructor === section.constructor ) {
						params.type = type;
						return true;
					}
					return false;
				} );
			}

			Container.prototype.initialize.call( section, id, params );

			section.id = id;
			section.panel = new api.Value();
			section.panel.bind( function ( id ) {
				$( section.headContainer ).toggleClass( 'control-subsection', !! id );
			});
			section.panel.set( section.params.panel || '' );
			api.utils.bubbleChildValueChanges( section, [ 'panel' ] );

			section.embed();
			section.deferred.embedded.done( function () {
				section.ready();
			});
		},

		/**
		 * Embed the container in the DOM when any parent panel is ready.
		 *
		 * @since 4.1.0
		 */
		embed: function () {
			var inject,
				section = this;

			section.containerParent = api.ensure( section.containerParent );

			// Watch for changes to the panel state.
			inject = function ( panelId ) {
				var parentContainer;
				if ( panelId ) {
					// The panel has been supplied, so wait until the panel object is registered.
					api.panel( panelId, function ( panel ) {
						// The panel has been registered, wait for it to become ready/initialized.
						panel.deferred.embedded.done( function () {
							parentContainer = panel.contentContainer;
							if ( ! section.headContainer.parent().is( parentContainer ) ) {
								parentContainer.append( section.headContainer );
							}
							if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
								section.containerParent.append( section.contentContainer );
							}
							section.deferred.embedded.resolve();
						});
					} );
				} else {
					// There is no panel, so embed the section in the root of the customizer.
					parentContainer = api.ensure( section.containerPaneParent );
					if ( ! section.headContainer.parent().is( parentContainer ) ) {
						parentContainer.append( section.headContainer );
					}
					if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
						section.containerParent.append( section.contentContainer );
					}
					section.deferred.embedded.resolve();
				}
			};
			section.panel.bind( inject );
			inject( section.panel.get() ); // Since a section may never get a panel, assume that it won't ever get one.
		},

		/**
		 * Add behaviors for the accordion section.
		 *
		 * @since 4.1.0
		 */
		attachEvents: function () {
			var meta, content, section = this;

			if ( section.container.hasClass( 'cannot-expand' ) ) {
				return;
			}

			// Expand/Collapse accordion sections on click.
			section.container.find( '.accordion-section-title, .customize-section-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( section.expanded() ) {
					section.collapse();
				} else {
					section.expand();
				}
			});

			// This is very similar to what is found for api.Panel.attachEvents().
			section.container.find( '.customize-section-title .customize-help-toggle' ).on( 'click', function() {

				meta = section.container.find( '.section-meta' );
				if ( meta.hasClass( 'cannot-expand' ) ) {
					return;
				}
				content = meta.find( '.customize-section-description:first' );
				content.toggleClass( 'open' );
				content.slideToggle( section.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				$( this ).attr( 'aria-expanded', function( i, attr ) {
					return 'true' === attr ? 'false' : 'true';
				});
			});
		},

		/**
		 * Return whether this section has any active controls.
		 *
		 * @since 4.1.0
		 *
		 * @return {boolean}
		 */
		isContextuallyActive: function () {
			var section = this,
				controls = section.controls(),
				activeCount = 0;
			_( controls ).each( function ( control ) {
				if ( control.active() ) {
					activeCount += 1;
				}
			} );
			return ( activeCount !== 0 );
		},

		/**
		 * Get the controls that are associated with this section, sorted by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @return {Array}
		 */
		controls: function () {
			return this._children( 'section', 'control' );
		},

		/**
		 * Update UI to reflect expanded state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean} expanded
		 * @param {Object}  args
		 */
		onChangeExpanded: function ( expanded, args ) {
			var section = this,
				container = section.headContainer.closest( '.wp-full-overlay-sidebar-content' ),
				content = section.contentContainer,
				overlay = section.headContainer.closest( '.wp-full-overlay' ),
				backBtn = content.find( '.customize-section-back' ),
				sectionTitle = section.headContainer.find( '.accordion-section-title' ).first(),
				expand, panel;

			if ( expanded && ! content.hasClass( 'open' ) ) {

				if ( args.unchanged ) {
					expand = args.completeCallback;
				} else {
					expand = function() {
						section._animateChangeExpanded( function() {
							sectionTitle.attr( 'tabindex', '-1' );
							backBtn.attr( 'tabindex', '0' );

							backBtn.trigger( 'focus' );
							content.css( 'top', '' );
							container.scrollTop( 0 );

							if ( args.completeCallback ) {
								args.completeCallback();
							}
						} );

						content.addClass( 'open' );
						overlay.addClass( 'section-open' );
						api.state( 'expandedSection' ).set( section );
					}.bind( this );
				}

				if ( ! args.allowMultiple ) {
					api.section.each( function ( otherSection ) {
						if ( otherSection !== section ) {
							otherSection.collapse( { duration: args.duration } );
						}
					});
				}

				if ( section.panel() ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					if ( ! args.allowMultiple ) {
						api.panel.each( function( panel ) {
							panel.collapse();
						});
					}
					expand();
				}

			} else if ( ! expanded && content.hasClass( 'open' ) ) {
				if ( section.panel() ) {
					panel = api.panel( section.panel() );
					if ( panel.contentContainer.hasClass( 'skip-transition' ) ) {
						panel.collapse();
					}
				}
				section._animateChangeExpanded( function() {
					backBtn.attr( 'tabindex', '-1' );
					sectionTitle.attr( 'tabindex', '0' );

					sectionTitle.trigger( 'focus' );
					content.css( 'top', '' );

					if ( args.completeCallback ) {
						args.completeCallback();
					}
				} );

				content.removeClass( 'open' );
				overlay.removeClass( 'section-open' );
				if ( section === api.state( 'expandedSection' ).get() ) {
					api.state( 'expandedSection' ).set( false );
				}

			} else {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		}
	});

	api.ThemesSection = api.Section.extend(/** @lends wp.customize.ThemesSection.prototype */{
		currentTheme: '',
		overlay: '',
		template: '',
		screenshotQueue: null,
		$window: null,
		$body: null,
		loaded: 0,
		loading: false,
		fullyLoaded: false,
		term: '',
		tags: '',
		nextTerm: '',
		nextTags: '',
		filtersHeight: 0,
		headerContainer: null,
		updateCountDebounced: null,

		/**
		 * wp.customize.ThemesSection
		 *
		 * Custom section for themes that loads themes by category, and also
		 * handles the theme-details view rendering and navigation.
		 *
		 * @constructs wp.customize.ThemesSection
		 * @augments   wp.customize.Section
		 *
		 * @since 4.9.0
		 *
		 * @param {string} id - ID.
		 * @param {Object} options - Options.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var section = this;
			section.headerContainer = $();
			section.$window = $( window );
			section.$body = $( document.body );
			api.Section.prototype.initialize.call( section, id, options );
			section.updateCountDebounced = _.debounce( section.updateCount, 500 );
		},

		/**
		 * Embed the section in the DOM when the themes panel is ready.
		 *
		 * Insert the section before the themes container. Assume that a themes section is within a panel, but not necessarily the themes panel.
		 *
		 * @since 4.9.0
		 */
		embed: function() {
			var inject,
				section = this;

			// Watch for changes to the panel state.
			inject = function( panelId ) {
				var parentContainer;
				api.panel( panelId, function( panel ) {

					// The panel has been registered, wait for it to become ready/initialized.
					panel.deferred.embedded.done( function() {
						parentContainer = panel.contentContainer;
						if ( ! section.headContainer.parent().is( parentContainer ) ) {
							parentContainer.find( '.customize-themes-full-container-container' ).before( section.headContainer );
						}
						if ( ! section.contentContainer.parent().is( section.headContainer ) ) {
							section.containerParent.append( section.contentContainer );
						}
						section.deferred.embedded.resolve();
					});
				} );
			};
			section.panel.bind( inject );
			inject( section.panel.get() ); // Since a section may never get a panel, assume that it won't ever get one.
		},

		/**
		 * Set up.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		ready: function() {
			var section = this;
			section.overlay = section.container.find( '.theme-overlay' );
			section.template = wp.template( 'customize-themes-details-view' );

			// Bind global keyboard events.
			section.container.on( 'keydown', function( event ) {
				if ( ! section.overlay.find( '.theme-wrap' ).is( ':visible' ) ) {
					return;
				}

				// Pressing the right arrow key fires a theme:next event.
				if ( 39 === event.keyCode ) {
					section.nextTheme();
				}

				// Pressing the left arrow key fires a theme:previous event.
				if ( 37 === event.keyCode ) {
					section.previousTheme();
				}

				// Pressing the escape key fires a theme:collapse event.
				if ( 27 === event.keyCode ) {
					if ( section.$body.hasClass( 'modal-open' ) ) {

						// Escape from the details modal.
						section.closeDetails();
					} else {

						// Escape from the inifinite scroll list.
						section.headerContainer.find( '.customize-themes-section-title' ).focus();
					}
					event.stopPropagation(); // Prevent section from being collapsed.
				}
			});

			section.renderScreenshots = _.throttle( section.renderScreenshots, 100 );

			_.bindAll( section, 'renderScreenshots', 'loadMore', 'checkTerm', 'filtersChecked' );
		},

		/**
		 * Override Section.isContextuallyActive method.
		 *
		 * Ignore the active states' of the contained theme controls, and just
		 * use the section's own active state instead. This prevents empty search
		 * results for theme sections from causing the section to become inactive.
		 *
		 * @since 4.2.0
		 *
		 * @return {boolean}
		 */
		isContextuallyActive: function () {
			return this.active();
		},

		/**
		 * Attach events.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		attachEvents: function () {
			var section = this, debounced;

			// Expand/Collapse accordion sections on click.
			section.container.find( '.customize-section-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.
				section.collapse();
			});

			section.headerContainer = $( '#accordion-section-' + section.id );

			// Expand section/panel. Only collapse when opening another section.
			section.headerContainer.on( 'click', '.customize-themes-section-title', function() {

				// Toggle accordion filters under section headers.
				if ( section.headerContainer.find( '.filter-details' ).length ) {
					section.headerContainer.find( '.customize-themes-section-title' )
						.toggleClass( 'details-open' )
						.attr( 'aria-expanded', function( i, attr ) {
							return 'true' === attr ? 'false' : 'true';
						});
					section.headerContainer.find( '.filter-details' ).slideToggle( 180 );
				}

				// Open the section.
				if ( ! section.expanded() ) {
					section.expand();
				}
			});

			// Preview installed themes.
			section.container.on( 'click', '.theme-actions .preview-theme', function() {
				api.panel( 'themes' ).loadThemePreview( $( this ).data( 'slug' ) );
			});

			// Theme navigation in details view.
			section.container.on( 'click', '.left', function() {
				section.previousTheme();
			});

			section.container.on( 'click', '.right', function() {
				section.nextTheme();
			});

			section.container.on( 'click', '.theme-backdrop, .close', function() {
				section.closeDetails();
			});

			if ( 'local' === section.params.filter_type ) {

				// Filter-search all theme objects loaded in the section.
				section.container.on( 'input', '.wp-filter-search-themes', function( event ) {
					section.filterSearch( event.currentTarget.value );
				});

			} else if ( 'remote' === section.params.filter_type ) {

				// Event listeners for remote queries with user-entered terms.
				// Search terms.
				debounced = _.debounce( section.checkTerm, 500 ); // Wait until there is no input for 500 milliseconds to initiate a search.
				section.contentContainer.on( 'input', '.wp-filter-search', function() {
					if ( ! api.panel( 'themes' ).expanded() ) {
						return;
					}
					debounced( section );
					if ( ! section.expanded() ) {
						section.expand();
					}
				});

				// Feature filters.
				section.contentContainer.on( 'click', '.filter-group input', function() {
					section.filtersChecked();
					section.checkTerm( section );
				});
			}

			// Toggle feature filters.
			section.contentContainer.on( 'click', '.feature-filter-toggle', function( e ) {
				var $themeContainer = $( '.customize-themes-full-container' ),
					$filterToggle = $( e.currentTarget );
				section.filtersHeight = $filterToggle.parent().next( '.filter-drawer' ).height();

				if ( 0 < $themeContainer.scrollTop() ) {
					$themeContainer.animate( { scrollTop: 0 }, 400 );

					if ( $filterToggle.hasClass( 'open' ) ) {
						return;
					}
				}

				$filterToggle
					.toggleClass( 'open' )
					.attr( 'aria-expanded', function( i, attr ) {
						return 'true' === attr ? 'false' : 'true';
					})
					.parent().next( '.filter-drawer' ).slideToggle( 180, 'linear' );

				if ( $filterToggle.hasClass( 'open' ) ) {
					var marginOffset = 1018 < window.innerWidth ? 50 : 76;

					section.contentContainer.find( '.themes' ).css( 'margin-top', section.filtersHeight + marginOffset );
				} else {
					section.contentContainer.find( '.themes' ).css( 'margin-top', 0 );
				}
			});

			// Setup section cross-linking.
			section.contentContainer.on( 'click', '.no-themes-local .search-dotorg-themes', function() {
				api.section( 'wporg_themes' ).focus();
			});

			function updateSelectedState() {
				var el = section.headerContainer.find( '.customize-themes-section-title' );
				el.toggleClass( 'selected', section.expanded() );
				el.attr( 'aria-expanded', section.expanded() ? 'true' : 'false' );
				if ( ! section.expanded() ) {
					el.removeClass( 'details-open' );
				}
			}
			section.expanded.bind( updateSelectedState );
			updateSelectedState();

			// Move section controls to the themes area.
			api.bind( 'ready', function () {
				section.contentContainer = section.container.find( '.customize-themes-section' );
				section.contentContainer.appendTo( $( '.customize-themes-full-container' ) );
				section.container.add( section.headerContainer );
			});
		},

		/**
		 * Update UI to reflect expanded state
		 *
		 * @since 4.2.0
		 *
		 * @param {boolean}  expanded
		 * @param {Object}   args
		 * @param {boolean}  args.unchanged
		 * @param {Function} args.completeCallback
		 * @return {void}
		 */
		onChangeExpanded: function ( expanded, args ) {

			// Note: there is a second argument 'args' passed.
			var section = this,
				container = section.contentContainer.closest( '.customize-themes-full-container' );

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			function expand() {

				// Try to load controls if none are loaded yet.
				if ( 0 === section.loaded ) {
					section.loadThemes();
				}

				// Collapse any sibling sections/panels.
				api.section.each( function ( otherSection ) {
					var searchTerm;

					if ( otherSection !== section ) {

						// Try to sync the current search term to the new section.
						if ( 'themes' === otherSection.params.type ) {
							searchTerm = otherSection.contentContainer.find( '.wp-filter-search' ).val();
							section.contentContainer.find( '.wp-filter-search' ).val( searchTerm );

							// Directly initialize an empty remote search to avoid a race condition.
							if ( '' === searchTerm && '' !== section.term && 'local' !== section.params.filter_type ) {
								section.term = '';
								section.initializeNewQuery( section.term, section.tags );
							} else {
								if ( 'remote' === section.params.filter_type ) {
									section.checkTerm( section );
								} else if ( 'local' === section.params.filter_type ) {
									section.filterSearch( searchTerm );
								}
							}
							otherSection.collapse( { duration: args.duration } );
						}
					}
				});

				section.contentContainer.addClass( 'current-section' );
				container.scrollTop();

				container.on( 'scroll', _.throttle( section.renderScreenshots, 300 ) );
				container.on( 'scroll', _.throttle( section.loadMore, 300 ) );

				if ( args.completeCallback ) {
					args.completeCallback();
				}
				section.updateCount(); // Show this section's count.
			}

			if ( expanded ) {
				if ( section.panel() && api.panel.has( section.panel() ) ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					expand();
				}
			} else {
				section.contentContainer.removeClass( 'current-section' );

				// Always hide, even if they don't exist or are already hidden.
				section.headerContainer.find( '.filter-details' ).slideUp( 180 );

				container.off( 'scroll' );

				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		},

		/**
		 * Return the section's content element without detaching from the parent.
		 *
		 * @since 4.9.0
		 *
		 * @return {jQuery}
		 */
		getContent: function() {
			return this.container.find( '.control-section-content' );
		},

		/**
		 * Load theme data via Ajax and add themes to the section as controls.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		loadThemes: function() {
			var section = this, params, page, request;

			if ( section.loading ) {
				return; // We're already loading a batch of themes.
			}

			// Parameters for every API query. Additional params are set in PHP.
			page = Math.ceil( section.loaded / 100 ) + 1;
			params = {
				'nonce': api.settings.nonce.switch_themes,
				'wp_customize': 'on',
				'theme_action': section.params.action,
				'customized_theme': api.settings.theme.stylesheet,
				'page': page
			};

			// Add fields for remote filtering.
			if ( 'remote' === section.params.filter_type ) {
				params.search = section.term;
				params.tags = section.tags;
			}

			// Load themes.
			section.headContainer.closest( '.wp-full-overlay' ).addClass( 'loading' );
			section.loading = true;
			section.container.find( '.no-themes' ).hide();
			request = wp.ajax.post( 'customize_load_themes', params );
			request.done(function( data ) {
				var themes = data.themes;

				// Stop and try again if the term changed while loading.
				if ( '' !== section.nextTerm || '' !== section.nextTags ) {
					if ( section.nextTerm ) {
						section.term = section.nextTerm;
					}
					if ( section.nextTags ) {
						section.tags = section.nextTags;
					}
					section.nextTerm = '';
					section.nextTags = '';
					section.loading = false;
					section.loadThemes();
					return;
				}

				if ( 0 !== themes.length ) {

					section.loadControls( themes, page );

					if ( 1 === page ) {

						// Pre-load the first 3 theme screenshots.
						_.each( section.controls().slice( 0, 3 ), function( control ) {
							var img, src = control.params.theme.screenshot[0];
							if ( src ) {
								img = new Image();
								img.src = src;
							}
						});
						if ( 'local' !== section.params.filter_type ) {
							wp.a11y.speak( api.settings.l10n.themeSearchResults.replace( '%d', data.info.results ) );
						}
					}

					_.delay( section.renderScreenshots, 100 ); // Wait for the controls to become visible.

					if ( 'local' === section.params.filter_type || 100 > themes.length ) {
						// If we have less than the requested 100 themes, it's the end of the list.
						section.fullyLoaded = true;
					}
				} else {
					if ( 0 === section.loaded ) {
						section.container.find( '.no-themes' ).show();
						wp.a11y.speak( section.container.find( '.no-themes' ).text() );
					} else {
						section.fullyLoaded = true;
					}
				}
				if ( 'local' === section.params.filter_type ) {
					section.updateCount(); // Count of visible theme controls.
				} else {
					section.updateCount( data.info.results ); // Total number of results including pages not yet loaded.
				}
				section.container.find( '.unexpected-error' ).hide(); // Hide error notice in case it was previously shown.

				// This cannot run on request.always, as section.loading may turn false before the new controls load in the success case.
				section.headContainer.closest( '.wp-full-overlay' ).removeClass( 'loading' );
				section.loading = false;
			});
			request.fail(function( data ) {
				if ( 'undefined' === typeof data ) {
					section.container.find( '.unexpected-error' ).show();
					wp.a11y.speak( section.container.find( '.unexpected-error' ).text() );
				} else if ( 'undefined' !== typeof console && console.error ) {
					console.error( data );
				}

				// This cannot run on request.always, as section.loading may turn false before the new controls load in the success case.
				section.headContainer.closest( '.wp-full-overlay' ).removeClass( 'loading' );
				section.loading = false;
			});
		},

		/**
		 * Loads controls into the section from data received from loadThemes().
		 *
		 * @since 4.9.0
		 * @param {Array}  themes - Array of theme data to create controls with.
		 * @param {number} page   - Page of results being loaded.
		 * @return {void}
		 */
		loadControls: function( themes, page ) {
			var newThemeControls = [],
				section = this;

			// Add controls for each theme.
			_.each( themes, function( theme ) {
				var themeControl = new api.controlConstructor.theme( section.params.action + '_theme_' + theme.id, {
					type: 'theme',
					section: section.params.id,
					theme: theme,
					priority: section.loaded + 1
				} );

				api.control.add( themeControl );
				newThemeControls.push( themeControl );
				section.loaded = section.loaded + 1;
			});

			if ( 1 !== page ) {
				Array.prototype.push.apply( section.screenshotQueue, newThemeControls ); // Add new themes to the screenshot queue.
			}
		},

		/**
		 * Determines whether more themes should be loaded, and loads them.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		loadMore: function() {
			var section = this, container, bottom, threshold;
			if ( ! section.fullyLoaded && ! section.loading ) {
				container = section.container.closest( '.customize-themes-full-container' );

				bottom = container.scrollTop() + container.height();
				// Use a fixed distance to the bottom of loaded results to avoid unnecessarily
				// loading results sooner when using a percentage of scroll distance.
				threshold = container.prop( 'scrollHeight' ) - 3000;

				if ( bottom > threshold ) {
					section.loadThemes();
				}
			}
		},

		/**
		 * Event handler for search input that filters visible controls.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} term - The raw search input value.
		 * @return {void}
		 */
		filterSearch: function( term ) {
			var count = 0,
				visible = false,
				section = this,
				noFilter = ( api.section.has( 'wporg_themes' ) && 'remote' !== section.params.filter_type ) ? '.no-themes-local' : '.no-themes',
				controls = section.controls(),
				terms;

			if ( section.loading ) {
				return;
			}

			// Standardize search term format and split into an array of individual words.
			terms = term.toLowerCase().trim().replace( /-/g, ' ' ).split( ' ' );

			_.each( controls, function( control ) {
				visible = control.filter( terms ); // Shows/hides and sorts control based on the applicability of the search term.
				if ( visible ) {
					count = count + 1;
				}
			});

			if ( 0 === count ) {
				section.container.find( noFilter ).show();
				wp.a11y.speak( section.container.find( noFilter ).text() );
			} else {
				section.container.find( noFilter ).hide();
			}

			section.renderScreenshots();
			api.reflowPaneContents();

			// Update theme count.
			section.updateCountDebounced( count );
		},

		/**
		 * Event handler for search input that determines if the terms have changed and loads new controls as needed.
		 *
		 * @since 4.9.0
		 *
		 * @param {wp.customize.ThemesSection} section - The current theme section, passed through the debouncer.
		 * @return {void}
		 */
		checkTerm: function( section ) {
			var newTerm;
			if ( 'remote' === section.params.filter_type ) {
				newTerm = section.contentContainer.find( '.wp-filter-search' ).val();
				if ( section.term !== newTerm.trim() ) {
					section.initializeNewQuery( newTerm, section.tags );
				}
			}
		},

		/**
		 * Check for filters checked in the feature filter list and initialize a new query.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		filtersChecked: function() {
			var section = this,
			    items = section.container.find( '.filter-group' ).find( ':checkbox' ),
			    tags = [];

			_.each( items.filter( ':checked' ), function( item ) {
				tags.push( $( item ).prop( 'value' ) );
			});

			// When no filters are checked, restore initial state. Update filter count.
			if ( 0 === tags.length ) {
				tags = '';
				section.contentContainer.find( '.feature-filter-toggle .filter-count-0' ).show();
				section.contentContainer.find( '.feature-filter-toggle .filter-count-filters' ).hide();
			} else {
				section.contentContainer.find( '.feature-filter-toggle .theme-filter-count' ).text( tags.length );
				section.contentContainer.find( '.feature-filter-toggle .filter-count-0' ).hide();
				section.contentContainer.find( '.feature-filter-toggle .filter-count-filters' ).show();
			}

			// Check whether tags have changed, and either load or queue them.
			if ( ! _.isEqual( section.tags, tags ) ) {
				if ( section.loading ) {
					section.nextTags = tags;
				} else {
					if ( 'remote' === section.params.filter_type ) {
						section.initializeNewQuery( section.term, tags );
					} else if ( 'local' === section.params.filter_type ) {
						section.filterSearch( tags.join( ' ' ) );
					}
				}
			}
		},

		/**
		 * Reset the current query and load new results.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} newTerm - New term.
		 * @param {Array} newTags - New tags.
		 * @return {void}
		 */
		initializeNewQuery: function( newTerm, newTags ) {
			var section = this;

			// Clear the controls in the section.
			_.each( section.controls(), function( control ) {
				control.container.remove();
				api.control.remove( control.id );
			});
			section.loaded = 0;
			section.fullyLoaded = false;
			section.screenshotQueue = null;

			// Run a new query, with loadThemes handling paging, etc.
			if ( ! section.loading ) {
				section.term = newTerm;
				section.tags = newTags;
				section.loadThemes();
			} else {
				section.nextTerm = newTerm; // This will reload from loadThemes() with the newest term once the current batch is loaded.
				section.nextTags = newTags; // This will reload from loadThemes() with the newest tags once the current batch is loaded.
			}
			if ( ! section.expanded() ) {
				section.expand(); // Expand the section if it isn't expanded.
			}
		},

		/**
		 * Render control's screenshot if the control comes into view.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		renderScreenshots: function() {
			var section = this;

			// Fill queue initially, or check for more if empty.
			if ( null === section.screenshotQueue || 0 === section.screenshotQueue.length ) {

				// Add controls that haven't had their screenshots rendered.
				section.screenshotQueue = _.filter( section.controls(), function( control ) {
					return ! control.screenshotRendered;
				});
			}

			// Are all screenshots rendered (for now)?
			if ( ! section.screenshotQueue.length ) {
				return;
			}

			section.screenshotQueue = _.filter( section.screenshotQueue, function( control ) {
				var $imageWrapper = control.container.find( '.theme-screenshot' ),
					$image = $imageWrapper.find( 'img' );

				if ( ! $image.length ) {
					return false;
				}

				if ( $image.is( ':hidden' ) ) {
					return true;
				}

				// Based on unveil.js.
				var wt = section.$window.scrollTop(),
					wb = wt + section.$window.height(),
					et = $image.offset().top,
					ih = $imageWrapper.height(),
					eb = et + ih,
					threshold = ih * 3,
					inView = eb >= wt - threshold && et <= wb + threshold;

				if ( inView ) {
					control.container.trigger( 'render-screenshot' );
				}

				// If the image is in view return false so it's cleared from the queue.
				return ! inView;
			} );
		},

		/**
		 * Get visible count.
		 *
		 * @since 4.9.0
		 *
		 * @return {number} Visible count.
		 */
		getVisibleCount: function() {
			return this.contentContainer.find( 'li.customize-control:visible' ).length;
		},

		/**
		 * Update the number of themes in the section.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		updateCount: function( count ) {
			var section = this, countEl, displayed;

			if ( ! count && 0 !== count ) {
				count = section.getVisibleCount();
			}

			displayed = section.contentContainer.find( '.themes-displayed' );
			countEl = section.contentContainer.find( '.theme-count' );

			if ( 0 === count ) {
				countEl.text( '0' );
			} else {

				// Animate the count change for emphasis.
				displayed.fadeOut( 180, function() {
					countEl.text( count );
					displayed.fadeIn( 180 );
				} );
				wp.a11y.speak( api.settings.l10n.announceThemeCount.replace( '%d', count ) );
			}
		},

		/**
		 * Advance the modal to the next theme.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		nextTheme: function () {
			var section = this;
			if ( section.getNextTheme() ) {
				section.showDetails( section.getNextTheme(), function() {
					section.overlay.find( '.right' ).focus();
				} );
			}
		},

		/**
		 * Get the next theme model.
		 *
		 * @since 4.2.0
		 *
		 * @return {wp.customize.ThemeControl|boolean} Next theme.
		 */
		getNextTheme: function () {
			var section = this, control, nextControl, sectionControls, i;
			control = api.control( section.params.action + '_theme_' + section.currentTheme );
			sectionControls = section.controls();
			i = _.indexOf( sectionControls, control );
			if ( -1 === i ) {
				return false;
			}

			nextControl = sectionControls[ i + 1 ];
			if ( ! nextControl ) {
				return false;
			}
			return nextControl.params.theme;
		},

		/**
		 * Advance the modal to the previous theme.
		 *
		 * @since 4.2.0
		 * @return {void}
		 */
		previousTheme: function () {
			var section = this;
			if ( section.getPreviousTheme() ) {
				section.showDetails( section.getPreviousTheme(), function() {
					section.overlay.find( '.left' ).focus();
				} );
			}
		},

		/**
		 * Get the previous theme model.
		 *
		 * @since 4.2.0
		 * @return {wp.customize.ThemeControl|boolean} Previous theme.
		 */
		getPreviousTheme: function () {
			var section = this, control, nextControl, sectionControls, i;
			control = api.control( section.params.action + '_theme_' + section.currentTheme );
			sectionControls = section.controls();
			i = _.indexOf( sectionControls, control );
			if ( -1 === i ) {
				return false;
			}

			nextControl = sectionControls[ i - 1 ];
			if ( ! nextControl ) {
				return false;
			}
			return nextControl.params.theme;
		},

		/**
		 * Disable buttons when we're viewing the first or last theme.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		updateLimits: function () {
			if ( ! this.getNextTheme() ) {
				this.overlay.find( '.right' ).addClass( 'disabled' );
			}
			if ( ! this.getPreviousTheme() ) {
				this.overlay.find( '.left' ).addClass( 'disabled' );
			}
		},

		/**
		 * Load theme preview.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @deprecated
		 * @param {string} themeId Theme ID.
		 * @return {jQuery.promise} Promise.
		 */
		loadThemePreview: function( themeId ) {
			return api.ThemesPanel.prototype.loadThemePreview.call( this, themeId );
		},

		/**
		 * Render & show the theme details for a given theme model.
		 *
		 * @since 4.2.0
		 *
		 * @param {Object} theme - Theme.
		 * @param {Function} [callback] - Callback once the details have been shown.
		 * @return {void}
		 */
		showDetails: function ( theme, callback ) {
			var section = this, panel = api.panel( 'themes' );
			section.currentTheme = theme.id;
			section.overlay.html( section.template( theme ) )
				.fadeIn( 'fast' )
				.focus();

			function disableSwitchButtons() {
				return ! panel.canSwitchTheme( theme.id );
			}

			// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
			function disableInstallButtons() {
				return disableSwitchButtons() || false === api.settings.theme._canInstall || true === api.settings.theme._filesystemCredentialsNeeded;
			}

			section.overlay.find( 'button.preview, button.preview-theme' ).toggleClass( 'disabled', disableSwitchButtons() );
			section.overlay.find( 'button.theme-install' ).toggleClass( 'disabled', disableInstallButtons() );

			section.$body.addClass( 'modal-open' );
			section.containFocus( section.overlay );
			section.updateLimits();
			wp.a11y.speak( api.settings.l10n.announceThemeDetails.replace( '%s', theme.name ) );
			if ( callback ) {
				callback();
			}
		},

		/**
		 * Close the theme details modal.
		 *
		 * @since 4.2.0
		 *
		 * @return {void}
		 */
		closeDetails: function () {
			var section = this;
			section.$body.removeClass( 'modal-open' );
			section.overlay.fadeOut( 'fast' );
			api.control( section.params.action + '_theme_' + section.currentTheme ).container.find( '.theme' ).focus();
		},

		/**
		 * Keep tab focus within the theme details modal.
		 *
		 * @since 4.2.0
		 *
		 * @param {jQuery} el - Element to contain focus.
		 * @return {void}
		 */
		containFocus: function( el ) {
			var tabbables;

			el.on( 'keydown', function( event ) {

				// Return if it's not the tab key
				// When navigating with prev/next focus is already handled.
				if ( 9 !== event.keyCode ) {
					return;
				}

				// Uses jQuery UI to get the tabbable elements.
				tabbables = $( ':tabbable', el );

				// Keep focus within the overlay.
				if ( tabbables.last()[0] === event.target && ! event.shiftKey ) {
					tabbables.first().focus();
					return false;
				} else if ( tabbables.first()[0] === event.target && event.shiftKey ) {
					tabbables.last().focus();
					return false;
				}
			});
		}
	});

	api.OuterSection = api.Section.extend(/** @lends wp.customize.OuterSection.prototype */{

		/**
		 * Class wp.customize.OuterSection.
		 *
		 * Creates section outside of the sidebar, there is no ui to trigger collapse/expand so
		 * it would require custom handling.
		 *
		 * @constructs wp.customize.OuterSection
		 * @augments   wp.customize.Section
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		initialize: function() {
			var section = this;
			section.containerParent = '#customize-outer-theme-controls';
			section.containerPaneParent = '.customize-outer-pane-parent';
			api.Section.prototype.initialize.apply( section, arguments );
		},

		/**
		 * Overrides api.Section.prototype.onChangeExpanded to prevent collapse/expand effect
		 * on other sections and panels.
		 *
		 * @since 4.9.0
		 *
		 * @param {boolean}  expanded - The expanded state to transition to.
		 * @param {Object}   [args] - Args.
		 * @param {boolean}  [args.unchanged] - Whether the state is already known to not be changed, and so short-circuit with calling completeCallback early.
		 * @param {Function} [args.completeCallback] - Function to call when the slideUp/slideDown has completed.
		 * @param {Object}   [args.duration] - The duration for the animation.
		 */
		onChangeExpanded: function( expanded, args ) {
			var section = this,
				container = section.headContainer.closest( '.wp-full-overlay-sidebar-content' ),
				content = section.contentContainer,
				backBtn = content.find( '.customize-section-back' ),
				sectionTitle = section.headContainer.find( '.accordion-section-title' ).first(),
				body = $( document.body ),
				expand, panel;

			body.toggleClass( 'outer-section-open', expanded );
			section.container.toggleClass( 'open', expanded );
			section.container.removeClass( 'busy' );
			api.section.each( function( _section ) {
				if ( 'outer' === _section.params.type && _section.id !== section.id ) {
					_section.container.removeClass( 'open' );
				}
			} );

			if ( expanded && ! content.hasClass( 'open' ) ) {

				if ( args.unchanged ) {
					expand = args.completeCallback;
				} else {
					expand = function() {
						section._animateChangeExpanded( function() {
							sectionTitle.attr( 'tabindex', '-1' );
							backBtn.attr( 'tabindex', '0' );

							backBtn.trigger( 'focus' );
							content.css( 'top', '' );
							container.scrollTop( 0 );

							if ( args.completeCallback ) {
								args.completeCallback();
							}
						} );

						content.addClass( 'open' );
					}.bind( this );
				}

				if ( section.panel() ) {
					api.panel( section.panel() ).expand({
						duration: args.duration,
						completeCallback: expand
					});
				} else {
					expand();
				}

			} else if ( ! expanded && content.hasClass( 'open' ) ) {
				if ( section.panel() ) {
					panel = api.panel( section.panel() );
					if ( panel.contentContainer.hasClass( 'skip-transition' ) ) {
						panel.collapse();
					}
				}
				section._animateChangeExpanded( function() {
					backBtn.attr( 'tabindex', '-1' );
					sectionTitle.attr( 'tabindex', '0' );

					sectionTitle.trigger( 'focus' );
					content.css( 'top', '' );

					if ( args.completeCallback ) {
						args.completeCallback();
					}
				} );

				content.removeClass( 'open' );

			} else {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			}
		}
	});

	api.Panel = Container.extend(/** @lends wp.customize.Panel.prototype */{
		containerType: 'panel',

		/**
		 * @constructs wp.customize.Panel
		 * @augments   wp.customize~Container
		 *
		 * @since 4.1.0
		 *
		 * @param {string}  id - The ID for the panel.
		 * @param {Object}  options - Object containing one property: params.
		 * @param {string}  options.title - Title shown when panel is collapsed and expanded.
		 * @param {string}  [options.description] - Description shown at the top of the panel.
		 * @param {number}  [options.priority=100] - The sort priority for the panel.
		 * @param {string}  [options.type=default] - The type of the panel. See wp.customize.panelConstructor.
		 * @param {string}  [options.content] - The markup to be used for the panel container. If empty, a JS template is used.
		 * @param {boolean} [options.active=true] - Whether the panel is active or not.
		 * @param {Object}  [options.params] - Deprecated wrapper for the above properties.
		 */
		initialize: function ( id, options ) {
			var panel = this, params;
			params = options.params || options;

			// Look up the type if one was not supplied.
			if ( ! params.type ) {
				_.find( api.panelConstructor, function( Constructor, type ) {
					if ( Constructor === panel.constructor ) {
						params.type = type;
						return true;
					}
					return false;
				} );
			}

			Container.prototype.initialize.call( panel, id, params );

			panel.embed();
			panel.deferred.embedded.done( function () {
				panel.ready();
			});
		},

		/**
		 * Embed the container in the DOM when any parent panel is ready.
		 *
		 * @since 4.1.0
		 */
		embed: function () {
			var panel = this,
				container = $( '#customize-theme-controls' ),
				parentContainer = $( '.customize-pane-parent' ); // @todo This should be defined elsewhere, and to be configurable.

			if ( ! panel.headContainer.parent().is( parentContainer ) ) {
				parentContainer.append( panel.headContainer );
			}
			if ( ! panel.contentContainer.parent().is( panel.headContainer ) ) {
				container.append( panel.contentContainer );
			}
			panel.renderContent();

			panel.deferred.embedded.resolve();
		},

		/**
		 * @since 4.1.0
		 */
		attachEvents: function () {
			var meta, panel = this;

			// Expand/Collapse accordion sections on click.
			panel.headContainer.find( '.accordion-section-title' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( ! panel.expanded() ) {
					panel.expand();
				}
			});

			// Close panel.
			panel.container.find( '.customize-panel-back' ).on( 'click keydown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}
				event.preventDefault(); // Keep this AFTER the key filter above.

				if ( panel.expanded() ) {
					panel.collapse();
				}
			});

			meta = panel.container.find( '.panel-meta:first' );

			meta.find( '> .accordion-section-title .customize-help-toggle' ).on( 'click', function() {
				if ( meta.hasClass( 'cannot-expand' ) ) {
					return;
				}

				var content = meta.find( '.customize-panel-description:first' );
				if ( meta.hasClass( 'open' ) ) {
					meta.toggleClass( 'open' );
					content.slideUp( panel.defaultExpandedArguments.duration, function() {
						content.trigger( 'toggled' );
					} );
					$( this ).attr( 'aria-expanded', false );
				} else {
					content.slideDown( panel.defaultExpandedArguments.duration, function() {
						content.trigger( 'toggled' );
					} );
					meta.toggleClass( 'open' );
					$( this ).attr( 'aria-expanded', true );
				}
			});

		},

		/**
		 * Get the sections that are associated with this panel, sorted by their priority Value.
		 *
		 * @since 4.1.0
		 *
		 * @return {Array}
		 */
		sections: function () {
			return this._children( 'panel', 'section' );
		},

		/**
		 * Return whether this panel has any active sections.
		 *
		 * @since 4.1.0
		 *
		 * @return {boolean} Whether contextually active.
		 */
		isContextuallyActive: function () {
			var panel = this,
				sections = panel.sections(),
				activeCount = 0;
			_( sections ).each( function ( section ) {
				if ( section.active() && section.isContextuallyActive() ) {
					activeCount += 1;
				}
			} );
			return ( activeCount !== 0 );
		},

		/**
		 * Update UI to reflect expanded state.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  expanded
		 * @param {Object}   args
		 * @param {boolean}  args.unchanged
		 * @param {Function} args.completeCallback
		 * @return {void}
		 */
		onChangeExpanded: function ( expanded, args ) {

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			// Note: there is a second argument 'args' passed.
			var panel = this,
				accordionSection = panel.contentContainer,
				overlay = accordionSection.closest( '.wp-full-overlay' ),
				container = accordionSection.closest( '.wp-full-overlay-sidebar-content' ),
				topPanel = panel.headContainer.find( '.accordion-section-title' ),
				backBtn = accordionSection.find( '.customize-panel-back' ),
				childSections = panel.sections(),
				skipTransition;

			if ( expanded && ! accordionSection.hasClass( 'current-panel' ) ) {
				// Collapse any sibling sections/panels.
				api.section.each( function ( section ) {
					if ( panel.id !== section.panel() ) {
						section.collapse( { duration: 0 } );
					}
				});
				api.panel.each( function ( otherPanel ) {
					if ( panel !== otherPanel ) {
						otherPanel.collapse( { duration: 0 } );
					}
				});

				if ( panel.params.autoExpandSoleSection && 1 === childSections.length && childSections[0].active.get() ) {
					accordionSection.addClass( 'current-panel skip-transition' );
					overlay.addClass( 'in-sub-panel' );

					childSections[0].expand( {
						completeCallback: args.completeCallback
					} );
				} else {
					panel._animateChangeExpanded( function() {
						topPanel.attr( 'tabindex', '-1' );
						backBtn.attr( 'tabindex', '0' );

						backBtn.trigger( 'focus' );
						accordionSection.css( 'top', '' );
						container.scrollTop( 0 );

						if ( args.completeCallback ) {
							args.completeCallback();
						}
					} );

					accordionSection.addClass( 'current-panel' );
					overlay.addClass( 'in-sub-panel' );
				}

				api.state( 'expandedPanel' ).set( panel );

			} else if ( ! expanded && accordionSection.hasClass( 'current-panel' ) ) {
				skipTransition = accordionSection.hasClass( 'skip-transition' );
				if ( ! skipTransition ) {
					panel._animateChangeExpanded( function() {
						topPanel.attr( 'tabindex', '0' );
						backBtn.attr( 'tabindex', '-1' );

						topPanel.focus();
						accordionSection.css( 'top', '' );

						if ( args.completeCallback ) {
							args.completeCallback();
						}
					} );
				} else {
					accordionSection.removeClass( 'skip-transition' );
				}

				overlay.removeClass( 'in-sub-panel' );
				accordionSection.removeClass( 'current-panel' );
				if ( panel === api.state( 'expandedPanel' ).get() ) {
					api.state( 'expandedPanel' ).set( false );
				}
			}
		},

		/**
		 * Render the panel from its JS template, if it exists.
		 *
		 * The panel's container must already exist in the DOM.
		 *
		 * @since 4.3.0
		 */
		renderContent: function () {
			var template,
				panel = this;

			// Add the content to the container.
			if ( 0 !== $( '#tmpl-' + panel.templateSelector + '-content' ).length ) {
				template = wp.template( panel.templateSelector + '-content' );
			} else {
				template = wp.template( 'customize-panel-default-content' );
			}
			if ( template && panel.headContainer ) {
				panel.contentContainer.html( template( _.extend(
					{ id: panel.id },
					panel.params
				) ) );
			}
		}
	});

	api.ThemesPanel = api.Panel.extend(/** @lends wp.customize.ThemsPanel.prototype */{

		/**
		 *  Class wp.customize.ThemesPanel.
		 *
		 * Custom section for themes that displays without the customize preview.
		 *
		 * @constructs wp.customize.ThemesPanel
		 * @augments   wp.customize.Panel
		 *
		 * @since 4.9.0
		 *
		 * @param {string} id - The ID for the panel.
		 * @param {Object} options - Options.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var panel = this;
			panel.installingThemes = [];
			api.Panel.prototype.initialize.call( panel, id, options );
		},

		/**
		 * Determine whether a given theme can be switched to, or in general.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} [slug] - Theme slug.
		 * @return {boolean} Whether the theme can be switched to.
		 */
		canSwitchTheme: function canSwitchTheme( slug ) {
			if ( slug && slug === api.settings.theme.stylesheet ) {
				return true;
			}
			return 'publish' === api.state( 'selectedChangesetStatus' ).get() && ( '' === api.state( 'changesetStatus' ).get() || 'auto-draft' === api.state( 'changesetStatus' ).get() );
		},

		/**
		 * Attach events.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		attachEvents: function() {
			var panel = this;

			// Attach regular panel events.
			api.Panel.prototype.attachEvents.apply( panel );

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._canInstall && api.settings.theme._filesystemCredentialsNeeded ) {
				panel.notifications.add( new api.Notification( 'theme_install_unavailable', {
					message: api.l10n.themeInstallUnavailable,
					type: 'info',
					dismissible: true
				} ) );
			}

			function toggleDisabledNotifications() {
				if ( panel.canSwitchTheme() ) {
					panel.notifications.remove( 'theme_switch_unavailable' );
				} else {
					panel.notifications.add( new api.Notification( 'theme_switch_unavailable', {
						message: api.l10n.themePreviewUnavailable,
						type: 'warning'
					} ) );
				}
			}
			toggleDisabledNotifications();
			api.state( 'selectedChangesetStatus' ).bind( toggleDisabledNotifications );
			api.state( 'changesetStatus' ).bind( toggleDisabledNotifications );

			// Collapse panel to customize the current theme.
			panel.contentContainer.on( 'click', '.customize-theme', function() {
				panel.collapse();
			});

			// Toggle between filtering and browsing themes on mobile.
			panel.contentContainer.on( 'click', '.customize-themes-section-title, .customize-themes-mobile-back', function() {
				$( '.wp-full-overlay' ).toggleClass( 'showing-themes' );
			});

			// Install (and maybe preview) a theme.
			panel.contentContainer.on( 'click', '.theme-install', function( event ) {
				panel.installTheme( event );
			});

			// Update a theme. Theme cards have the class, the details modal has the id.
			panel.contentContainer.on( 'click', '.update-theme, #update-theme', function( event ) {

				// #update-theme is a link.
				event.preventDefault();
				event.stopPropagation();

				panel.updateTheme( event );
			});

			// Delete a theme.
			panel.contentContainer.on( 'click', '.delete-theme', function( event ) {
				panel.deleteTheme( event );
			});

			_.bindAll( panel, 'installTheme', 'updateTheme' );
		},

		/**
		 * Update UI to reflect expanded state
		 *
		 * @since 4.9.0
		 *
		 * @param {boolean}  expanded - Expanded state.
		 * @param {Object}   args - Args.
		 * @param {boolean}  args.unchanged - Whether or not the state changed.
		 * @param {Function} args.completeCallback - Callback to execute when the animation completes.
		 * @return {void}
		 */
		onChangeExpanded: function( expanded, args ) {
			var panel = this, overlay, sections, hasExpandedSection = false;

			// Expand/collapse the panel normally.
			api.Panel.prototype.onChangeExpanded.apply( this, [ expanded, args ] );

			// Immediately call the complete callback if there were no changes.
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			overlay = panel.headContainer.closest( '.wp-full-overlay' );

			if ( expanded ) {
				overlay
					.addClass( 'in-themes-panel' )
					.delay( 200 ).find( '.customize-themes-full-container' ).addClass( 'animate' );

				_.delay( function() {
					overlay.addClass( 'themes-panel-expanded' );
				}, 200 );

				// Automatically open the first section (except on small screens), if one isn't already expanded.
				if ( 600 < window.innerWidth ) {
					sections = panel.sections();
					_.each( sections, function( section ) {
						if ( section.expanded() ) {
							hasExpandedSection = true;
						}
					} );
					if ( ! hasExpandedSection && sections.length > 0 ) {
						sections[0].expand();
					}
				}
			} else {
				overlay
					.removeClass( 'in-themes-panel themes-panel-expanded' )
					.find( '.customize-themes-full-container' ).removeClass( 'animate' );
			}
		},

		/**
		 * Install a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {jQuery.promise} Promise.
		 */
		installTheme: function( event ) {
			var panel = this, preview, onInstallSuccess, slug = $( event.target ).data( 'slug' ), deferred = $.Deferred(), request;
			preview = $( event.target ).hasClass( 'preview' );

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._filesystemCredentialsNeeded ) {
				deferred.reject({
					errorCode: 'theme_install_unavailable'
				});
				return deferred.promise();
			}

			// Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
			if ( ! panel.canSwitchTheme( slug ) ) {
				deferred.reject({
					errorCode: 'theme_switch_unavailable'
				});
				return deferred.promise();
			}

			// Theme is already being installed.
			if ( _.contains( panel.installingThemes, slug ) ) {
				deferred.reject({
					errorCode: 'theme_already_installing'
				});
				return deferred.promise();
			}

			wp.updates.maybeRequestFilesystemCredentials( event );

			onInstallSuccess = function( response ) {
				var theme = false, themeControl;
				if ( preview ) {
					api.notifications.remove( 'theme_installing' );

					panel.loadThemePreview( slug );

				} else {
					api.control.each( function( control ) {
						if ( 'theme' === control.params.type && control.params.theme.id === response.slug ) {
							theme = control.params.theme; // Used below to add theme control.
							control.rerenderAsInstalled( true );
						}
					});

					// Don't add the same theme more than once.
					if ( ! theme || api.control.has( 'installed_theme_' + theme.id ) ) {
						deferred.resolve( response );
						return;
					}

					// Add theme control to installed section.
					theme.type = 'installed';
					themeControl = new api.controlConstructor.theme( 'installed_theme_' + theme.id, {
						type: 'theme',
						section: 'installed_themes',
						theme: theme,
						priority: 0 // Add all newly-installed themes to the top.
					} );

					api.control.add( themeControl );
					api.control( themeControl.id ).container.trigger( 'render-screenshot' );

					// Close the details modal if it's open to the installed theme.
					api.section.each( function( section ) {
						if ( 'themes' === section.params.type ) {
							if ( theme.id === section.currentTheme ) { // Don't close the modal if the user has navigated elsewhere.
								section.closeDetails();
							}
						}
					});
				}
				deferred.resolve( response );
			};

			panel.installingThemes.push( slug ); // Note: we don't remove elements from installingThemes, since they shouldn't be installed again.
			request = wp.updates.installTheme( {
				slug: slug
			} );

			// Also preview the theme as the event is triggered on Install & Preview.
			if ( preview ) {
				api.notifications.add( new api.OverlayNotification( 'theme_installing', {
					message: api.l10n.themeDownloading,
					type: 'info',
					loading: true
				} ) );
			}

			request.done( onInstallSuccess );
			request.fail( function() {
				api.notifications.remove( 'theme_installing' );
			} );

			return deferred.promise();
		},

		/**
		 * Load theme preview.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} themeId Theme ID.
		 * @return {jQuery.promise} Promise.
		 */
		loadThemePreview: function( themeId ) {
			var panel = this, deferred = $.Deferred(), onceProcessingComplete, urlParser, queryParams;

			// Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
			if ( ! panel.canSwitchTheme( themeId ) ) {
				deferred.reject({
					errorCode: 'theme_switch_unavailable'
				});
				return deferred.promise();
			}

			urlParser = document.createElement( 'a' );
			urlParser.href = location.href;
			queryParams = _.extend(
				api.utils.parseQueryString( urlParser.search.substr( 1 ) ),
				{
					theme: themeId,
					changeset_uuid: api.settings.changeset.uuid,
					'return': api.settings.url['return']
				}
			);

			// Include autosaved param to load autosave revision without prompting user to restore it.
			if ( ! api.state( 'saved' ).get() ) {
				queryParams.customize_autosaved = 'on';
			}

			urlParser.search = $.param( queryParams );

			// Update loading message. Everything else is handled by reloading the page.
			api.notifications.add( new api.OverlayNotification( 'theme_previewing', {
				message: api.l10n.themePreviewWait,
				type: 'info',
				loading: true
			} ) );

			onceProcessingComplete = function() {
				var request;
				if ( api.state( 'processing' ).get() > 0 ) {
					return;
				}

				api.state( 'processing' ).unbind( onceProcessingComplete );

				request = api.requestChangesetUpdate( {}, { autosave: true } );
				request.done( function() {
					deferred.resolve();
					$( window ).off( 'beforeunload.customize-confirm' );
					location.replace( urlParser.href );
				} );
				request.fail( function() {

					// @todo Show notification regarding failure.
					api.notifications.remove( 'theme_previewing' );

					deferred.reject();
				} );
			};

			if ( 0 === api.state( 'processing' ).get() ) {
				onceProcessingComplete();
			} else {
				api.state( 'processing' ).bind( onceProcessingComplete );
			}

			return deferred.promise();
		},

		/**
		 * Update a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		updateTheme: function( event ) {
			wp.updates.maybeRequestFilesystemCredentials( event );

			$( document ).one( 'wp-theme-update-success', function( e, response ) {

				// Rerender the control to reflect the update.
				api.control.each( function( control ) {
					if ( 'theme' === control.params.type && control.params.theme.id === response.slug ) {
						control.params.theme.hasUpdate = false;
						control.params.theme.version = response.newVersion;
						setTimeout( function() {
							control.rerenderAsInstalled( true );
						}, 2000 );
					}
				});
			} );

			wp.updates.updateTheme( {
				slug: $( event.target ).closest( '.notice' ).data( 'slug' )
			} );
		},

		/**
		 * Delete a theme via wp.updates.
		 *
		 * @since 4.9.0
		 *
		 * @param {jQuery.Event} event - Event.
		 * @return {void}
		 */
		deleteTheme: function( event ) {
			var theme, section;
			theme = $( event.target ).data( 'slug' );
			section = api.section( 'installed_themes' );

			event.preventDefault();

			// Temporary since supplying SFTP credentials does not work yet. See #42184.
			if ( api.settings.theme._filesystemCredentialsNeeded ) {
				return;
			}

			// Confirmation dialog for deleting a theme.
			if ( ! window.confirm( api.settings.l10n.confirmDeleteTheme ) ) {
				return;
			}

			wp.updates.maybeRequestFilesystemCredentials( event );

			$( document ).one( 'wp-theme-delete-success', function() {
				var control = api.control( 'installed_theme_' + theme );

				// Remove theme control.
				control.container.remove();
				api.control.remove( control.id );

				// Update installed count.
				section.loaded = section.loaded - 1;
				section.updateCount();

				// Rerender any other theme controls as uninstalled.
				api.control.each( function( control ) {
					if ( 'theme' === control.params.type && control.params.theme.id === theme ) {
						control.rerenderAsInstalled( false );
					}
				});
			} );

			wp.updates.deleteTheme( {
				slug: theme
			} );

			// Close modal and focus the section.
			section.closeDetails();
			section.focus();
		}
	});

	api.Control = api.Class.extend(/** @lends wp.customize.Control.prototype */{
		defaultActiveArguments: { duration: 'fast', completeCallback: $.noop },

		/**
		 * Default params.
		 *
		 * @since 4.9.0
		 * @var {object}
		 */
		defaults: {
			label: '',
			description: '',
			active: true,
			priority: 10
		},

		/**
		 * A Customizer Control.
		 *
		 * A control provides a UI element that allows a user to modify a Customizer Setting.
		 *
		 * @see PHP class WP_Customize_Control.
		 *
		 * @constructs wp.customize.Control
		 * @augments   wp.customize.Class
		 *
		 * @borrows wp.customize~focus as this#focus
		 * @borrows wp.customize~Container#activate as this#activate
		 * @borrows wp.customize~Container#deactivate as this#deactivate
		 * @borrows wp.customize~Container#_toggleActive as this#_toggleActive
		 *
		 * @param {string} id                       - Unique identifier for the control instance.
		 * @param {Object} options                  - Options hash for the control instance.
		 * @param {Object} options.type             - Type of control (e.g. text, radio, dropdown-pages, etc.)
		 * @param {string} [options.content]        - The HTML content for the control or at least its container. This should normally be left blank and instead supplying a templateId.
		 * @param {string} [options.templateId]     - Template ID for control's content.
		 * @param {string} [options.priority=10]    - Order of priority to show the control within the section.
		 * @param {string} [options.active=true]    - Whether the control is active.
		 * @param {string} options.section          - The ID of the section the control belongs to.
		 * @param {mixed}  [options.setting]        - The ID of the main setting or an instance of this setting.
		 * @param {mixed}  options.settings         - An object with keys (e.g. default) that maps to setting IDs or Setting/Value objects, or an array of setting IDs or Setting/Value objects.
		 * @param {mixed}  options.settings.default - The ID of the setting the control relates to.
		 * @param {string} options.settings.data    - @todo Is this used?
		 * @param {string} options.label            - Label.
		 * @param {string} options.description      - Description.
		 * @param {number} [options.instanceNumber] - Order in which this instance was created in relation to other instances.
		 * @param {Object} [options.params]         - Deprecated wrapper for the above properties.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var control = this, deferredSettingIds = [], settings, gatherSettings;

			control.params = _.extend(
				{},
				control.defaults,
				control.params || {}, // In case subclass already defines.
				options.params || options || {} // The options.params property is deprecated, but it is checked first for back-compat.
			);

			if ( ! api.Control.instanceCounter ) {
				api.Control.instanceCounter = 0;
			}
			api.Control.instanceCounter++;
			if ( ! control.params.instanceNumber ) {
				control.params.instanceNumber = api.Control.instanceCounter;
			}

			// Look up the type if one was not supplied.
			if ( ! control.params.type ) {
				_.find( api.controlConstructor, function( Constructor, type ) {
					if ( Constructor === control.constructor ) {
						control.params.type = type;
						return true;
					}
					return false;
				} );
			}

			if ( ! control.params.content ) {
				control.params.content = $( '<li></li>', {
					id: 'customize-control-' + id.replace( /]/g, '' ).replace( /\[/g, '-' ),
					'class': 'customize-control customize-control-' + control.params.type
				} );
			}

			control.id = id;
			control.selector = '#customize-control-' + id.replace( /\]/g, '' ).replace( /\[/g, '-' ); // Deprecated, likely dead code from time before #28709.
			if ( control.params.content ) {
				control.container = $( control.params.content );
			} else {
				control.container = $( control.selector ); // Likely dead, per above. See #28709.
			}

			if ( control.params.templateId ) {
				control.templateSelector = control.params.templateId;
			} else {
				control.templateSelector = 'customize-control-' + control.params.type + '-content';
			}

			control.deferred = _.extend( control.deferred || {}, {
				embedded: new $.Deferred()
			} );
			control.section = new api.Value();
			control.priority = new api.Value();
			control.active = new api.Value();
			control.activeArgumentsQueue = [];
			control.notifications = new api.Notifications({
				alt: control.altNotice
			});

			control.elements = [];

			control.active.bind( function ( active ) {
				var args = control.activeArgumentsQueue.shift();
				args = $.extend( {}, control.defaultActiveArguments, args );
				control.onChangeActive( active, args );
			} );

			control.section.set( control.params.section );
			control.priority.set( isNaN( control.params.priority ) ? 10 : control.params.priority );
			control.active.set( control.params.active );

			api.utils.bubbleChildValueChanges( control, [ 'section', 'priority', 'active' ] );

			control.settings = {};

			settings = {};
			if ( control.params.setting ) {
				settings['default'] = control.params.setting;
			}
			_.extend( settings, control.params.settings );

			// Note: Settings can be an array or an object, with values being either setting IDs or Setting (or Value) objects.
			_.each( settings, function( value, key ) {
				var setting;
				if ( _.isObject( value ) && _.isFunction( value.extended ) && value.extended( api.Value ) ) {
					control.settings[ key ] = value;
				} else if ( _.isString( value ) ) {
					setting = api( value );
					if ( setting ) {
						control.settings[ key ] = setting;
					} else {
						deferredSettingIds.push( value );
					}
				}
			} );

			gatherSettings = function() {

				// Fill-in all resolved settings.
				_.each( settings, function ( settingId, key ) {
					if ( ! control.settings[ key ] && _.isString( settingId ) ) {
						control.settings[ key ] = api( settingId );
					}
				} );

				// Make sure settings passed as array gets associated with default.
				if ( control.settings[0] && ! control.settings['default'] ) {
					control.settings['default'] = control.settings[0];
				}

				// Identify the main setting.
				control.setting = control.settings['default'] || null;

				control.linkElements(); // Link initial elements present in server-rendered content.
				control.embed();
			};

			if ( 0 === deferredSettingIds.length ) {
				gatherSettings();
			} else {
				api.apply( api, deferredSettingIds.concat( gatherSettings ) );
			}

			// After the control is embedded on the page, invoke the "ready" method.
			control.deferred.embedded.done( function () {
				control.linkElements(); // Link any additional elements after template is rendered by renderContent().
				control.setupNotifications();
				control.ready();
			});
		},

		/**
		 * Link elements between settings and inputs.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {void}
		 */
		linkElements: function () {
			var control = this, nodes, radios, element;

			nodes = control.container.find( '[data-customize-setting-link], [data-customize-setting-key-link]' );
			radios = {};

			nodes.each( function () {
				var node = $( this ), name, setting;

				if ( node.data( 'customizeSettingLinked' ) ) {
					return;
				}
				node.data( 'customizeSettingLinked', true ); // Prevent re-linking element.

				if ( node.is( ':radio' ) ) {
					name = node.prop( 'name' );
					if ( radios[name] ) {
						return;
					}

					radios[name] = true;
					node = nodes.filter( '[name="' + name + '"]' );
				}

				// Let link by default refer to setting ID. If it doesn't exist, fallback to looking up by setting key.
				if ( node.data( 'customizeSettingLink' ) ) {
					setting = api( node.data( 'customizeSettingLink' ) );
				} else if ( node.data( 'customizeSettingKeyLink' ) ) {
					setting = control.settings[ node.data( 'customizeSettingKeyLink' ) ];
				}

				if ( setting ) {
					element = new api.Element( node );
					control.elements.push( element );
					element.sync( setting );
					element.set( setting() );
				}
			} );
		},

		/**
		 * Embed the control into the page.
		 */
		embed: function () {
			var control = this,
				inject;

			// Watch for changes to the section state.
			inject = function ( sectionId ) {
				var parentContainer;
				if ( ! sectionId ) { // @todo Allow a control to be embedded without a section, for instance a control embedded in the front end.
					return;
				}
				// Wait for the section to be registered.
				api.section( sectionId, function ( section ) {
					// Wait for the section to be ready/initialized.
					section.deferred.embedded.done( function () {
						parentContainer = ( section.contentContainer.is( 'ul' ) ) ? section.contentContainer : section.contentContainer.find( 'ul:first' );
						if ( ! control.container.parent().is( parentContainer ) ) {
							parentContainer.append( control.container );
						}
						control.renderContent();
						control.deferred.embedded.resolve();
					});
				});
			};
			control.section.bind( inject );
			inject( control.section.get() );
		},

		/**
		 * Triggered when the control's markup has been injected into the DOM.
		 *
		 * @return {void}
		 */
		ready: function() {
			var control = this, newItem;
			if ( 'dropdown-pages' === control.params.type && control.params.allow_addition ) {
				newItem = control.container.find( '.new-content-item' );
				newItem.hide(); // Hide in JS to preserve flex display when showing.
				control.container.on( 'click', '.add-new-toggle', function( e ) {
					$( e.currentTarget ).slideUp( 180 );
					newItem.slideDown( 180 );
					newItem.find( '.create-item-input' ).focus();
				});
				control.container.on( 'click', '.add-content', function() {
					control.addNewPage();
				});
				control.container.on( 'keydown', '.create-item-input', function( e ) {
					if ( 13 === e.which ) { // Enter.
						control.addNewPage();
					}
				});
			}
		},

		/**
		 * Get the element inside of a control's container that contains the validation error message.
		 *
		 * Control subclasses may override this to return the proper container to render notifications into.
		 * Injects the notification container for existing controls that lack the necessary container,
		 * including special handling for nav menu items and widgets.
		 *
		 * @since 4.6.0
		 * @return {jQuery} Setting validation message element.
		 */
		getNotificationsContainerElement: function() {
			var control = this, controlTitle, notificationsContainer;

			notificationsContainer = control.container.find( '.customize-control-notifications-container:first' );
			if ( notificationsContainer.length ) {
				return notificationsContainer;
			}

			notificationsContainer = $( '<div class="customize-control-notifications-container"></div>' );

			if ( control.container.hasClass( 'customize-control-nav_menu_item' ) ) {
				control.container.find( '.menu-item-settings:first' ).prepend( notificationsContainer );
			} else if ( control.container.hasClass( 'customize-control-widget_form' ) ) {
				control.container.find( '.widget-inside:first' ).prepend( notificationsContainer );
			} else {
				controlTitle = control.container.find( '.customize-control-title' );
				if ( controlTitle.length ) {
					controlTitle.after( notificationsContainer );
				} else {
					control.container.prepend( notificationsContainer );
				}
			}
			return notificationsContainer;
		},

		/**
		 * Set up notifications.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		setupNotifications: function() {
			var control = this, renderNotificationsIfVisible, onSectionAssigned;

			// Add setting notifications to the control notification.
			_.each( control.settings, function( setting ) {
				if ( ! setting.notifications ) {
					return;
				}
				setting.notifications.bind( 'add', function( settingNotification ) {
					var params = _.extend(
						{},
						settingNotification,
						{
							setting: setting.id
						}
					);
					control.notifications.add( new api.Notification( setting.id + ':' + settingNotification.code, params ) );
				} );
				setting.notifications.bind( 'remove', function( settingNotification ) {
					control.notifications.remove( setting.id + ':' + settingNotification.code );
				} );
			} );

			renderNotificationsIfVisible = function() {
				var sectionId = control.section();
				if ( ! sectionId || ( api.section.has( sectionId ) && api.section( sectionId ).expanded() ) ) {
					control.notifications.render();
				}
			};

			control.notifications.bind( 'rendered', function() {
				var notifications = control.notifications.get();
				control.container.toggleClass( 'has-notifications', 0 !== notifications.length );
				control.container.toggleClass( 'has-error', 0 !== _.where( notifications, { type: 'error' } ).length );
			} );

			onSectionAssigned = function( newSectionId, oldSectionId ) {
				if ( oldSectionId && api.section.has( oldSectionId ) ) {
					api.section( oldSectionId ).expanded.unbind( renderNotificationsIfVisible );
				}
				if ( newSectionId ) {
					api.section( newSectionId, function( section ) {
						section.expanded.bind( renderNotificationsIfVisible );
						renderNotificationsIfVisible();
					});
				}
			};

			control.section.bind( onSectionAssigned );
			onSectionAssigned( control.section.get() );
			control.notifications.bind( 'change', _.debounce( renderNotificationsIfVisible ) );
		},

		/**
		 * Render notifications.
		 *
		 * Renders the `control.notifications` into the control's container.
		 * Control subclasses may override this method to do their own handling
		 * of rendering notifications.
		 *
		 * @deprecated in favor of `control.notifications.render()`
		 * @since 4.6.0
		 * @this {wp.customize.Control}
		 */
		renderNotifications: function() {
			var control = this, container, notifications, hasError = false;

			if ( 'undefined' !== typeof console && console.warn ) {
				console.warn( '[DEPRECATED] wp.customize.Control.prototype.renderNotifications() is deprecated in favor of instantiating a wp.customize.Notifications and calling its render() method.' );
			}

			container = control.getNotificationsContainerElement();
			if ( ! container || ! container.length ) {
				return;
			}
			notifications = [];
			control.notifications.each( function( notification ) {
				notifications.push( notification );
				if ( 'error' === notification.type ) {
					hasError = true;
				}
			} );

			if ( 0 === notifications.length ) {
				container.stop().slideUp( 'fast' );
			} else {
				container.stop().slideDown( 'fast', null, function() {
					$( this ).css( 'height', 'auto' );
				} );
			}

			if ( ! control.notificationsTemplate ) {
				control.notificationsTemplate = wp.template( 'customize-control-notifications' );
			}

			control.container.toggleClass( 'has-notifications', 0 !== notifications.length );
			control.container.toggleClass( 'has-error', hasError );
			container.empty().append(
				control.notificationsTemplate( { notifications: notifications, altNotice: Boolean( control.altNotice ) } ).trim()
			);
		},

		/**
		 * Normal controls do not expand, so just expand its parent
		 *
		 * @param {Object} [params]
		 */
		expand: function ( params ) {
			api.section( this.section() ).expand( params );
		},

		/*
		 * Documented using @borrows in the constructor.
		 */
		focus: focus,

		/**
		 * Update UI in response to a change in the control's active state.
		 * This does not change the active state, it merely handles the behavior
		 * for when it does change.
		 *
		 * @since 4.1.0
		 *
		 * @param {boolean}  active
		 * @param {Object}   args
		 * @param {number}   args.duration
		 * @param {Function} args.completeCallback
		 */
		onChangeActive: function ( active, args ) {
			if ( args.unchanged ) {
				if ( args.completeCallback ) {
					args.completeCallback();
				}
				return;
			}

			if ( ! $.contains( document, this.container[0] ) ) {
				// jQuery.fn.slideUp is not hiding an element if it is not in the DOM.
				this.container.toggle( active );
				if ( args.completeCallback ) {
					args.completeCallback();
				}
			} else if ( active ) {
				this.container.slideDown( args.duration, args.completeCallback );
			} else {
				this.container.slideUp( args.duration, args.completeCallback );
			}
		},

		/**
		 * @deprecated 4.1.0 Use this.onChangeActive() instead.
		 */
		toggle: function ( active ) {
			return this.onChangeActive( active, this.defaultActiveArguments );
		},

		/*
		 * Documented using @borrows in the constructor
		 */
		activate: Container.prototype.activate,

		/*
		 * Documented using @borrows in the constructor
		 */
		deactivate: Container.prototype.deactivate,

		/*
		 * Documented using @borrows in the constructor
		 */
		_toggleActive: Container.prototype._toggleActive,

		// @todo This function appears to be dead code and can be removed.
		dropdownInit: function() {
			var control      = this,
				statuses     = this.container.find('.dropdown-status'),
				params       = this.params,
				toggleFreeze = false,
				update       = function( to ) {
					if ( 'string' === typeof to && params.statuses && params.statuses[ to ] ) {
						statuses.html( params.statuses[ to ] ).show();
					} else {
						statuses.hide();
					}
				};

			// Support the .dropdown class to open/close complex elements.
			this.container.on( 'click keydown', '.dropdown', function( event ) {
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}

				event.preventDefault();

				if ( ! toggleFreeze ) {
					control.container.toggleClass( 'open' );
				}

				if ( control.container.hasClass( 'open' ) ) {
					control.container.parent().parent().find( 'li.library-selected' ).focus();
				}

				// Don't want to fire focus and click at same time.
				toggleFreeze = true;
				setTimeout(function () {
					toggleFreeze = false;
				}, 400);
			});

			this.setting.bind( update );
			update( this.setting() );
		},

		/**
		 * Render the control from its JS template, if it exists.
		 *
		 * The control's container must already exist in the DOM.
		 *
		 * @since 4.1.0
		 */
		renderContent: function () {
			var control = this, template, standardTypes, templateId, sectionId;

			standardTypes = [
				'button',
				'checkbox',
				'date',
				'datetime-local',
				'email',
				'month',
				'number',
				'password',
				'radio',
				'range',
				'search',
				'select',
				'tel',
				'time',
				'text',
				'textarea',
				'week',
				'url'
			];

			templateId = control.templateSelector;

			// Use default content template when a standard HTML type is used,
			// there isn't a more specific template existing, and the control container is empty.
			if ( templateId === 'customize-control-' + control.params.type + '-content' &&
				_.contains( standardTypes, control.params.type ) &&
				! document.getElementById( 'tmpl-' + templateId ) &&
				0 === control.container.children().length )
			{
				templateId = 'customize-control-default-content';
			}

			// Replace the container element's content with the control.
			if ( document.getElementById( 'tmpl-' + templateId ) ) {
				template = wp.template( templateId );
				if ( template && control.container ) {
					control.container.html( template( control.params ) );
				}
			}

			// Re-render notifications after content has been re-rendered.
			control.notifications.container = control.getNotificationsContainerElement();
			sectionId = control.section();
			if ( ! sectionId || ( api.section.has( sectionId ) && api.section( sectionId ).expanded() ) ) {
				control.notifications.render();
			}
		},

		/**
		 * Add a new page to a dropdown-pages control reusing menus code for this.
		 *
		 * @since 4.7.0
		 * @access private
		 *
		 * @return {void}
		 */
		addNewPage: function () {
			var control = this, promise, toggle, container, input, title, select;

			if ( 'dropdown-pages' !== control.params.type || ! control.params.allow_addition || ! api.Menus ) {
				return;
			}

			toggle = control.container.find( '.add-new-toggle' );
			container = control.container.find( '.new-content-item' );
			input = control.container.find( '.create-item-input' );
			title = input.val();
			select = control.container.find( 'select' );

			if ( ! title ) {
				input.addClass( 'invalid' );
				return;
			}

			input.removeClass( 'invalid' );
			input.attr( 'disabled', 'disabled' );

			// The menus functions add the page, publish when appropriate,
			// and also add the new page to the dropdown-pages controls.
			promise = api.Menus.insertAutoDraftPost( {
				post_title: title,
				post_type: 'page'
			} );
			promise.done( function( data ) {
				var availableItem, $content, itemTemplate;

				// Prepare the new page as an available menu item.
				// See api.Menus.submitNew().
				availableItem = new api.Menus.AvailableItemModel( {
					'id': 'post-' + data.post_id, // Used for available menu item Backbone models.
					'title': title,
					'type': 'post_type',
					'type_label': api.Menus.data.l10n.page_label,
					'object': 'page',
					'object_id': data.post_id,
					'url': data.url
				} );

				// Add the new item to the list of available menu items.
				api.Menus.availableMenuItemsPanel.collection.add( availableItem );
				$content = $( '#available-menu-items-post_type-page' ).find( '.available-menu-items-list' );
				itemTemplate = wp.template( 'available-menu-item' );
				$content.prepend( itemTemplate( availableItem.attributes ) );

				// Focus the select control.
				select.focus();
				control.setting.set( String( data.post_id ) ); // Triggers a preview refresh and updates the setting.

				// Reset the create page form.
				container.slideUp( 180 );
				toggle.slideDown( 180 );
			} );
			promise.always( function() {
				input.val( '' ).removeAttr( 'disabled' );
			} );
		}
	});

	/**
	 * A colorpicker control.
	 *
	 * @class    wp.customize.ColorControl
	 * @augments wp.customize.Control
	 */
	api.ColorControl = api.Control.extend(/** @lends wp.customize.ColorControl.prototype */{
		ready: function() {
			var control = this,
				isHueSlider = this.params.mode === 'hue',
				updating = false,
				picker;

			if ( isHueSlider ) {
				picker = this.container.find( '.color-picker-hue' );
				picker.val( control.setting() ).wpColorPicker({
					change: function( event, ui ) {
						updating = true;
						control.setting( ui.color.h() );
						updating = false;
					}
				});
			} else {
				picker = this.container.find( '.color-picker-hex' );
				picker.val( control.setting() ).wpColorPicker({
					change: function() {
						updating = true;
						control.setting.set( picker.wpColorPicker( 'color' ) );
						updating = false;
					},
					clear: function() {
						updating = true;
						control.setting.set( '' );
						updating = false;
					}
				});
			}

			control.setting.bind( function ( value ) {
				// Bail if the update came from the control itself.
				if ( updating ) {
					return;
				}
				picker.val( value );
				picker.wpColorPicker( 'color', value );
			} );

			// Collapse color picker when hitting Esc instead of collapsing the current section.
			control.container.on( 'keydown', function( event ) {
				var pickerContainer;
				if ( 27 !== event.which ) { // Esc.
					return;
				}
				pickerContainer = control.container.find( '.wp-picker-container' );
				if ( pickerContainer.hasClass( 'wp-picker-active' ) ) {
					picker.wpColorPicker( 'close' );
					control.container.find( '.wp-color-result' ).focus();
					event.stopPropagation(); // Prevent section from being collapsed.
				}
			} );
		}
	});

	/**
	 * A control that implements the media modal.
	 *
	 * @class    wp.customize.MediaControl
	 * @augments wp.customize.Control
	 */
	api.MediaControl = api.Control.extend(/** @lends wp.customize.MediaControl.prototype */{

		/**
		 * When the control's DOM structure is ready,
		 * set up internal event bindings.
		 */
		ready: function() {
			var control = this;
			// Shortcut so that we don't have to use _.bind every time we add a callback.
			_.bindAll( control, 'restoreDefault', 'removeFile', 'openFrame', 'select', 'pausePlayer' );

			// Bind events, with delegation to facilitate re-rendering.
			control.container.on( 'click keydown', '.upload-button', control.openFrame );
			control.container.on( 'click keydown', '.upload-button', control.pausePlayer );
			control.container.on( 'click keydown', '.thumbnail-image img', control.openFrame );
			control.container.on( 'click keydown', '.default-button', control.restoreDefault );
			control.container.on( 'click keydown', '.remove-button', control.pausePlayer );
			control.container.on( 'click keydown', '.remove-button', control.removeFile );
			control.container.on( 'click keydown', '.remove-button', control.cleanupPlayer );

			// Resize the player controls when it becomes visible (ie when section is expanded).
			api.section( control.section() ).container
				.on( 'expanded', function() {
					if ( control.player ) {
						control.player.setControlsSize();
					}
				})
				.on( 'collapsed', function() {
					control.pausePlayer();
				});

			/**
			 * Set attachment data and render content.
			 *
			 * Note that BackgroundImage.prototype.ready applies this ready method
			 * to itself. Since BackgroundImage is an UploadControl, the value
			 * is the attachment URL instead of the attachment ID. In this case
			 * we skip fetching the attachment data because we have no ID available,
			 * and it is the responsibility of the UploadControl to set the control's
			 * attachmentData before calling the renderContent method.
			 *
			 * @param {number|string} value Attachment
			 */
			function setAttachmentDataAndRenderContent( value ) {
				var hasAttachmentData = $.Deferred();

				if ( control.extended( api.UploadControl ) ) {
					hasAttachmentData.resolve();
				} else {
					value = parseInt( value, 10 );
					if ( _.isNaN( value ) || value <= 0 ) {
						delete control.params.attachment;
						hasAttachmentData.resolve();
					} else if ( control.params.attachment && control.params.attachment.id === value ) {
						hasAttachmentData.resolve();
					}
				}

				// Fetch the attachment data.
				if ( 'pending' === hasAttachmentData.state() ) {
					wp.media.attachment( value ).fetch().done( function() {
						control.params.attachment = this.attributes;
						hasAttachmentData.resolve();

						// Send attachment information to the preview for possible use in `postMessage` transport.
						wp.customize.previewer.send( control.setting.id + '-attachment-data', this.attributes );
					} );
				}

				hasAttachmentData.done( function() {
					control.renderContent();
				} );
			}

			// Ensure attachment data is initially set (for dynamically-instantiated controls).
			setAttachmentDataAndRenderContent( control.setting() );

			// Update the attachment data and re-render the control when the setting changes.
			control.setting.bind( setAttachmentDataAndRenderContent );
		},

		pausePlayer: function () {
			this.player && this.player.pause();
		},

		cleanupPlayer: function () {
			this.player && wp.media.mixin.removePlayer( this.player );
		},

		/**
		 * Open the media modal.
		 */
		openFrame: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}

			event.preventDefault();

			if ( ! this.frame ) {
				this.initFrame();
			}

			this.frame.open();
		},

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			this.frame = wp.media({
				button: {
					text: this.params.button_labels.frame_button
				},
				states: [
					new wp.media.controller.Library({
						title:     this.params.button_labels.frame_title,
						library:   wp.media.query({ type: this.params.mime_type }),
						multiple:  false,
						date:      false
					})
				]
			});

			// When a file is selected, run a callback.
			this.frame.on( 'select', this.select );
		},

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Gets the selected image information, and sets it within the control.
		 */
		select: function() {
			// Get the attachment from the modal frame.
			var node,
				attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				mejsSettings = window._wpmejsSettings || {};

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );
			node = this.container.find( 'audio, video' ).get(0);

			// Initialize audio/video previews.
			if ( node ) {
				this.player = new MediaElementPlayer( node, mejsSettings );
			} else {
				this.cleanupPlayer();
			}
		},

		/**
		 * Reset the setting to the default value.
		 */
		restoreDefault: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = this.params.defaultAttachment;
			this.setting( this.params.defaultAttachment.url );
		},

		/**
		 * Called when the "Remove" link is clicked. Empties the setting.
		 *
		 * @param {Object} event jQuery Event object
		 */
		removeFile: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = {};
			this.setting( '' );
			this.renderContent(); // Not bound to setting change when emptying.
		}
	});

	/**
	 * An upload control, which utilizes the media modal.
	 *
	 * @class    wp.customize.UploadControl
	 * @augments wp.customize.MediaControl
	 */
	api.UploadControl = api.MediaControl.extend(/** @lends wp.customize.UploadControl.prototype */{

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Gets the selected image information, and sets it within the control.
		 */
		select: function() {
			// Get the attachment from the modal frame.
			var node,
				attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				mejsSettings = window._wpmejsSettings || {};

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.url );
			node = this.container.find( 'audio, video' ).get(0);

			// Initialize audio/video previews.
			if ( node ) {
				this.player = new MediaElementPlayer( node, mejsSettings );
			} else {
				this.cleanupPlayer();
			}
		},

		// @deprecated
		success: function() {},

		// @deprecated
		removerVisibility: function() {}
	});

	/**
	 * A control for uploading images.
	 *
	 * This control no longer needs to do anything more
	 * than what the upload control does in JS.
	 *
	 * @class    wp.customize.ImageControl
	 * @augments wp.customize.UploadControl
	 */
	api.ImageControl = api.UploadControl.extend(/** @lends wp.customize.ImageControl.prototype */{
		// @deprecated
		thumbnailSrc: function() {}
	});

	/**
	 * A control for uploading background images.
	 *
	 * @class    wp.customize.BackgroundControl
	 * @augments wp.customize.UploadControl
	 */
	api.BackgroundControl = api.UploadControl.extend(/** @lends wp.customize.BackgroundControl.prototype */{

		/**
		 * When the control's DOM structure is ready,
		 * set up internal event bindings.
		 */
		ready: function() {
			api.UploadControl.prototype.ready.apply( this, arguments );
		},

		/**
		 * Callback handler for when an attachment is selected in the media modal.
		 * Does an additional Ajax request for setting the background context.
		 */
		select: function() {
			api.UploadControl.prototype.select.apply( this, arguments );

			wp.ajax.post( 'custom-background-add', {
				nonce: _wpCustomizeBackground.nonces.add,
				wp_customize: 'on',
				customize_theme: api.settings.theme.stylesheet,
				attachment_id: this.params.attachment.id
			} );
		}
	});

	/**
	 * A control for positioning a background image.
	 *
	 * @since 4.7.0
	 *
	 * @class    wp.customize.BackgroundPositionControl
	 * @augments wp.customize.Control
	 */
	api.BackgroundPositionControl = api.Control.extend(/** @lends wp.customize.BackgroundPositionControl.prototype */{

		/**
		 * Set up control UI once embedded in DOM and settings are created.
		 *
		 * @since 4.7.0
		 * @access public
		 */
		ready: function() {
			var control = this, updateRadios;

			control.container.on( 'change', 'input[name="background-position"]', function() {
				var position = $( this ).val().split( ' ' );
				control.settings.x( position[0] );
				control.settings.y( position[1] );
			} );

			updateRadios = _.debounce( function() {
				var x, y, radioInput, inputValue;
				x = control.settings.x.get();
				y = control.settings.y.get();
				inputValue = String( x ) + ' ' + String( y );
				radioInput = control.container.find( 'input[name="background-position"][value="' + inputValue + '"]' );
				radioInput.trigger( 'click' );
			} );
			control.settings.x.bind( updateRadios );
			control.settings.y.bind( updateRadios );

			updateRadios(); // Set initial UI.
		}
	} );

	/**
	 * A control for selecting and cropping an image.
	 *
	 * @class    wp.customize.CroppedImageControl
	 * @augments wp.customize.MediaControl
	 */
	api.CroppedImageControl = api.MediaControl.extend(/** @lends wp.customize.CroppedImageControl.prototype */{

		/**
		 * Open the media modal to the library state.
		 */
		openFrame: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}

			this.initFrame();
			this.frame.setState( 'library' ).open();
		},

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			var l10n = _wpMediaViewsL10n;

			this.frame = wp.media({
				button: {
					text: l10n.select,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title: this.params.button_labels.frame_title,
						library: wp.media.query({ type: 'image' }),
						multiple: false,
						date: false,
						priority: 20,
						suggestedWidth: this.params.width,
						suggestedHeight: this.params.height
					}),
					new wp.media.controller.CustomizeImageCropper({
						imgSelectOptions: this.calculateImageSelectOptions,
						control: this
					})
				]
			});

			this.frame.on( 'select', this.onSelect, this );
			this.frame.on( 'cropped', this.onCropped, this );
			this.frame.on( 'skippedcrop', this.onSkippedCrop, this );
		},

		/**
		 * After an image is selected in the media modal, switch to the cropper
		 * state if the image isn't the right size.
		 */
		onSelect: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON();

			if ( this.params.width === attachment.width && this.params.height === attachment.height && ! this.params.flex_width && ! this.params.flex_height ) {
				this.setImageFromAttachment( attachment );
				this.frame.close();
			} else {
				this.frame.setState( 'cropper' );
			}
		},

		/**
		 * After the image has been cropped, apply the cropped image data to the setting.
		 *
		 * @param {Object} croppedImage Cropped attachment data.
		 */
		onCropped: function( croppedImage ) {
			this.setImageFromAttachment( croppedImage );
		},

		/**
		 * Returns a set of options, computed from the attached image data and
		 * control-specific data, to be fed to the imgAreaSelect plugin in
		 * wp.media.view.Cropper.
		 *
		 * @param {wp.media.model.Attachment} attachment
		 * @param {wp.media.controller.Cropper} controller
		 * @return {Object} Options
		 */
		calculateImageSelectOptions: function( attachment, controller ) {
			var control    = controller.get( 'control' ),
				flexWidth  = !! parseInt( control.params.flex_width, 10 ),
				flexHeight = !! parseInt( control.params.flex_height, 10 ),
				realWidth  = attachment.get( 'width' ),
				realHeight = attachment.get( 'height' ),
				xInit = parseInt( control.params.width, 10 ),
				yInit = parseInt( control.params.height, 10 ),
				ratio = xInit / yInit,
				xImg  = xInit,
				yImg  = yInit,
				x1, y1, imgSelectOptions;

			controller.set( 'canSkipCrop', ! control.mustBeCropped( flexWidth, flexHeight, xInit, yInit, realWidth, realHeight ) );

			if ( realWidth / realHeight > ratio ) {
				yInit = realHeight;
				xInit = yInit * ratio;
			} else {
				xInit = realWidth;
				yInit = xInit / ratio;
			}

			x1 = ( realWidth - xInit ) / 2;
			y1 = ( realHeight - yInit ) / 2;

			imgSelectOptions = {
				handles: true,
				keys: true,
				instance: true,
				persistent: true,
				imageWidth: realWidth,
				imageHeight: realHeight,
				minWidth: xImg > xInit ? xInit : xImg,
				minHeight: yImg > yInit ? yInit : yImg,
				x1: x1,
				y1: y1,
				x2: xInit + x1,
				y2: yInit + y1
			};

			if ( flexHeight === false && flexWidth === false ) {
				imgSelectOptions.aspectRatio = xInit + ':' + yInit;
			}

			if ( true === flexHeight ) {
				delete imgSelectOptions.minHeight;
				imgSelectOptions.maxWidth = realWidth;
			}

			if ( true === flexWidth ) {
				delete imgSelectOptions.minWidth;
				imgSelectOptions.maxHeight = realHeight;
			}

			return imgSelectOptions;
		},

		/**
		 * Return whether the image must be cropped, based on required dimensions.
		 *
		 * @param {boolean} flexW
		 * @param {boolean} flexH
		 * @param {number}  dstW
		 * @param {number}  dstH
		 * @param {number}  imgW
		 * @param {number}  imgH
		 * @return {boolean}
		 */
		mustBeCropped: function( flexW, flexH, dstW, dstH, imgW, imgH ) {
			if ( true === flexW && true === flexH ) {
				return false;
			}

			if ( true === flexW && dstH === imgH ) {
				return false;
			}

			if ( true === flexH && dstW === imgW ) {
				return false;
			}

			if ( dstW === imgW && dstH === imgH ) {
				return false;
			}

			if ( imgW <= dstW ) {
				return false;
			}

			return true;
		},

		/**
		 * If cropping was skipped, apply the image data directly to the setting.
		 */
		onSkippedCrop: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON();
			this.setImageFromAttachment( attachment );
		},

		/**
		 * Updates the setting and re-renders the control UI.
		 *
		 * @param {Object} attachment
		 */
		setImageFromAttachment: function( attachment ) {
			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );
		}
	});

	/**
	 * A control for selecting and cropping Site Icons.
	 *
	 * @class    wp.customize.SiteIconControl
	 * @augments wp.customize.CroppedImageControl
	 */
	api.SiteIconControl = api.CroppedImageControl.extend(/** @lends wp.customize.SiteIconControl.prototype */{

		/**
		 * Create a media modal select frame, and store it so the instance can be reused when needed.
		 */
		initFrame: function() {
			var l10n = _wpMediaViewsL10n;

			this.frame = wp.media({
				button: {
					text: l10n.select,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title: this.params.button_labels.frame_title,
						library: wp.media.query({ type: 'image' }),
						multiple: false,
						date: false,
						priority: 20,
						suggestedWidth: this.params.width,
						suggestedHeight: this.params.height
					}),
					new wp.media.controller.SiteIconCropper({
						imgSelectOptions: this.calculateImageSelectOptions,
						control: this
					})
				]
			});

			this.frame.on( 'select', this.onSelect, this );
			this.frame.on( 'cropped', this.onCropped, this );
			this.frame.on( 'skippedcrop', this.onSkippedCrop, this );
		},

		/**
		 * After an image is selected in the media modal, switch to the cropper
		 * state if the image isn't the right size.
		 */
		onSelect: function() {
			var attachment = this.frame.state().get( 'selection' ).first().toJSON(),
				controller = this;

			if ( this.params.width === attachment.width && this.params.height === attachment.height && ! this.params.flex_width && ! this.params.flex_height ) {
				wp.ajax.post( 'crop-image', {
					nonce: attachment.nonces.edit,
					id: attachment.id,
					context: 'site-icon',
					cropDetails: {
						x1: 0,
						y1: 0,
						width: this.params.width,
						height: this.params.height,
						dst_width: this.params.width,
						dst_height: this.params.height
					}
				} ).done( function( croppedImage ) {
					controller.setImageFromAttachment( croppedImage );
					controller.frame.close();
				} ).fail( function() {
					controller.frame.trigger('content:error:crop');
				} );
			} else {
				this.frame.setState( 'cropper' );
			}
		},

		/**
		 * Updates the setting and re-renders the control UI.
		 *
		 * @param {Object} attachment
		 */
		setImageFromAttachment: function( attachment ) {
			var sizes = [ 'site_icon-32', 'thumbnail', 'full' ], link,
				icon;

			_.each( sizes, function( size ) {
				if ( ! icon && ! _.isUndefined ( attachment.sizes[ size ] ) ) {
					icon = attachment.sizes[ size ];
				}
			} );

			this.params.attachment = attachment;

			// Set the Customizer setting; the callback takes care of rendering.
			this.setting( attachment.id );

			if ( ! icon ) {
				return;
			}

			// Update the icon in-browser.
			link = $( 'link[rel="icon"][sizes="32x32"]' );
			link.attr( 'href', icon.url );
		},

		/**
		 * Called when the "Remove" link is clicked. Empties the setting.
		 *
		 * @param {Object} event jQuery Event object
		 */
		removeFile: function( event ) {
			if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
				return;
			}
			event.preventDefault();

			this.params.attachment = {};
			this.setting( '' );
			this.renderContent(); // Not bound to setting change when emptying.
			$( 'link[rel="icon"][sizes="32x32"]' ).attr( 'href', '/favicon.ico' ); // Set to default.
		}
	});

	/**
	 * @class    wp.customize.HeaderControl
	 * @augments wp.customize.Control
	 */
	api.HeaderControl = api.Control.extend(/** @lends wp.customize.HeaderControl.prototype */{
		ready: function() {
			this.btnRemove = $('#customize-control-header_image .actions .remove');
			this.btnNew    = $('#customize-control-header_image .actions .new');

			_.bindAll(this, 'openMedia', 'removeImage');

			this.btnNew.on( 'click', this.openMedia );
			this.btnRemove.on( 'click', this.removeImage );

			api.HeaderTool.currentHeader = this.getInitialHeaderImage();

			new api.HeaderTool.CurrentView({
				model: api.HeaderTool.currentHeader,
				el: '#customize-control-header_image .current .container'
			});

			new api.HeaderTool.ChoiceListView({
				collection: api.HeaderTool.UploadsList = new api.HeaderTool.ChoiceList(),
				el: '#customize-control-header_image .choices .uploaded .list'
			});

			new api.HeaderTool.ChoiceListView({
				collection: api.HeaderTool.DefaultsList = new api.HeaderTool.DefaultsList(),
				el: '#customize-control-header_image .choices .default .list'
			});

			api.HeaderTool.combinedList = api.HeaderTool.CombinedList = new api.HeaderTool.CombinedList([
				api.HeaderTool.UploadsList,
				api.HeaderTool.DefaultsList
			]);

			// Ensure custom-header-crop Ajax requests bootstrap the Customizer to activate the previewed theme.
			wp.media.controller.Cropper.prototype.defaults.doCropArgs.wp_customize = 'on';
			wp.media.controller.Cropper.prototype.defaults.doCropArgs.customize_theme = api.settings.theme.stylesheet;
		},

		/**
		 * Returns a new instance of api.HeaderTool.ImageModel based on the currently
		 * saved header image (if any).
		 *
		 * @since 4.2.0
		 *
		 * @return {Object} Options
		 */
		getInitialHeaderImage: function() {
			if ( ! api.get().header_image || ! api.get().header_image_data || _.contains( [ 'remove-header', 'random-default-image', 'random-uploaded-image' ], api.get().header_image ) ) {
				return new api.HeaderTool.ImageModel();
			}

			// Get the matching uploaded image object.
			var currentHeaderObject = _.find( _wpCustomizeHeader.uploads, function( imageObj ) {
				return ( imageObj.attachment_id === api.get().header_image_data.attachment_id );
			} );
			// Fall back to raw current header image.
			if ( ! currentHeaderObject ) {
				currentHeaderObject = {
					url: api.get().header_image,
					thumbnail_url: api.get().header_image,
					attachment_id: api.get().header_image_data.attachment_id
				};
			}

			return new api.HeaderTool.ImageModel({
				header: currentHeaderObject,
				choice: currentHeaderObject.url.split( '/' ).pop()
			});
		},

		/**
		 * Returns a set of options, computed from the attached image data and
		 * theme-specific data, to be fed to the imgAreaSelect plugin in
		 * wp.media.view.Cropper.
		 *
		 * @param {wp.media.model.Attachment} attachment
		 * @param {wp.media.controller.Cropper} controller
		 * @return {Object} Options
		 */
		calculateImageSelectOptions: function(attachment, controller) {
			var xInit = parseInt(_wpCustomizeHeader.data.width, 10),
				yInit = parseInt(_wpCustomizeHeader.data.height, 10),
				flexWidth = !! parseInt(_wpCustomizeHeader.data['flex-width'], 10),
				flexHeight = !! parseInt(_wpCustomizeHeader.data['flex-height'], 10),
				ratio, xImg, yImg, realHeight, realWidth,
				imgSelectOptions;

			realWidth = attachment.get('width');
			realHeight = attachment.get('height');

			this.headerImage = new api.HeaderTool.ImageModel();
			this.headerImage.set({
				themeWidth: xInit,
				themeHeight: yInit,
				themeFlexWidth: flexWidth,
				themeFlexHeight: flexHeight,
				imageWidth: realWidth,
				imageHeight: realHeight
			});

			controller.set( 'canSkipCrop', ! this.headerImage.shouldBeCropped() );

			ratio = xInit / yInit;
			xImg = realWidth;
			yImg = realHeight;

			if ( xImg / yImg > ratio ) {
				yInit = yImg;
				xInit = yInit * ratio;
			} else {
				xInit = xImg;
				yInit = xInit / ratio;
			}

			imgSelectOptions = {
				handles: true,
				keys: true,
				instance: true,
				persistent: true,
				imageWidth: realWidth,
				imageHeight: realHeight,
				x1: 0,
				y1: 0,
				x2: xInit,
				y2: yInit
			};

			if (flexHeight === false && flexWidth === false) {
				imgSelectOptions.aspectRatio = xInit + ':' + yInit;
			}
			if (flexHeight === false ) {
				imgSelectOptions.maxHeight = yInit;
			}
			if (flexWidth === false ) {
				imgSelectOptions.maxWidth = xInit;
			}

			return imgSelectOptions;
		},

		/**
		 * Sets up and opens the Media Manager in order to select an image.
		 * Depending on both the size of the image and the properties of the
		 * current theme, a cropping step after selection may be required or
		 * skippable.
		 *
		 * @param {event} event
		 */
		openMedia: function(event) {
			var l10n = _wpMediaViewsL10n;

			event.preventDefault();

			this.frame = wp.media({
				button: {
					text: l10n.selectAndCrop,
					close: false
				},
				states: [
					new wp.media.controller.Library({
						title:     l10n.chooseImage,
						library:   wp.media.query({ type: 'image' }),
						multiple:  false,
						date:      false,
						priority:  20,
						suggestedWidth: _wpCustomizeHeader.data.width,
						suggestedHeight: _wpCustomizeHeader.data.height
					}),
					new wp.media.controller.Cropper({
						imgSelectOptions: this.calculateImageSelectOptions
					})
				]
			});

			this.frame.on('select', this.onSelect, this);
			this.frame.on('cropped', this.onCropped, this);
			this.frame.on('skippedcrop', this.onSkippedCrop, this);

			this.frame.open();
		},

		/**
		 * After an image is selected in the media modal,
		 * switch to the cropper state.
		 */
		onSelect: function() {
			this.frame.setState('cropper');
		},

		/**
		 * After the image has been cropped, apply the cropped image data to the setting.
		 *
		 * @param {Object} croppedImage Cropped attachment data.
		 */
		onCropped: function(croppedImage) {
			var url = croppedImage.url,
				attachmentId = croppedImage.attachment_id,
				w = croppedImage.width,
				h = croppedImage.height;
			this.setImageFromURL(url, attachmentId, w, h);
		},

		/**
		 * If cropping was skipped, apply the image data directly to the setting.
		 *
		 * @param {Object} selection
		 */
		onSkippedCrop: function(selection) {
			var url = selection.get('url'),
				w = selection.get('width'),
				h = selection.get('height');
			this.setImageFromURL(url, selection.id, w, h);
		},

		/**
		 * Creates a new wp.customize.HeaderTool.ImageModel from provided
		 * header image data and inserts it into the user-uploaded headers
		 * collection.
		 *
		 * @param {string} url
		 * @param {number} attachmentId
		 * @param {number} width
		 * @param {number} height
		 */
		setImageFromURL: function(url, attachmentId, width, height) {
			var choice, data = {};

			data.url = url;
			data.thumbnail_url = url;
			data.timestamp = _.now();

			if (attachmentId) {
				data.attachment_id = attachmentId;
			}

			if (width) {
				data.width = width;
			}

			if (height) {
				data.height = height;
			}

			choice = new api.HeaderTool.ImageModel({
				header: data,
				choice: url.split('/').pop()
			});
			api.HeaderTool.UploadsList.add(choice);
			api.HeaderTool.currentHeader.set(choice.toJSON());
			choice.save();
			choice.importImage();
		},

		/**
		 * Triggers the necessary events to deselect an image which was set as
		 * the currently selected one.
		 */
		removeImage: function() {
			api.HeaderTool.currentHeader.trigger('hide');
			api.HeaderTool.CombinedList.trigger('control:removeImage');
		}

	});

	/**
	 * wp.customize.ThemeControl
	 *
	 * @class    wp.customize.ThemeControl
	 * @augments wp.customize.Control
	 */
	api.ThemeControl = api.Control.extend(/** @lends wp.customize.ThemeControl.prototype */{

		touchDrag: false,
		screenshotRendered: false,

		/**
		 * @since 4.2.0
		 */
		ready: function() {
			var control = this, panel = api.panel( 'themes' );

			function disableSwitchButtons() {
				return ! panel.canSwitchTheme( control.params.theme.id );
			}

			// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
			function disableInstallButtons() {
				return disableSwitchButtons() || false === api.settings.theme._canInstall || true === api.settings.theme._filesystemCredentialsNeeded;
			}
			function updateButtons() {
				control.container.find( 'button.preview, button.preview-theme' ).toggleClass( 'disabled', disableSwitchButtons() );
				control.container.find( 'button.theme-install' ).toggleClass( 'disabled', disableInstallButtons() );
			}

			api.state( 'selectedChangesetStatus' ).bind( updateButtons );
			api.state( 'changesetStatus' ).bind( updateButtons );
			updateButtons();

			control.container.on( 'touchmove', '.theme', function() {
				control.touchDrag = true;
			});

			// Bind details view trigger.
			control.container.on( 'click keydown touchend', '.theme', function( event ) {
				var section;
				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
					return;
				}

				// Bail if the user scrolled on a touch device.
				if ( control.touchDrag === true ) {
					return control.touchDrag = false;
				}

				// Prevent the modal from showing when the user clicks the action button.
				if ( $( event.target ).is( '.theme-actions .button, .update-theme' ) ) {
					return;
				}

				event.preventDefault(); // Keep this AFTER the key filter above.
				section = api.section( control.section() );
				section.showDetails( control.params.theme, function() {

					// Temporary special function since supplying SFTP credentials does not work yet. See #42184.
					if ( api.settings.theme._filesystemCredentialsNeeded ) {
						section.overlay.find( '.theme-actions .delete-theme' ).remove();
					}
				} );
			});

			control.container.on( 'render-screenshot', function() {
				var $screenshot = $( this ).find( 'img' ),
					source = $screenshot.data( 'src' );

				if ( source ) {
					$screenshot.attr( 'src', source );
				}
				control.screenshotRendered = true;
			});
		},

		/**
		 * Show or hide the theme based on the presence of the term in the title, description, tags, and author.
		 *
		 * @since 4.2.0
		 * @param {Array} terms - An array of terms to search for.
		 * @return {boolean} Whether a theme control was activated or not.
		 */
		filter: function( terms ) {
			var control = this,
				matchCount = 0,
				haystack = control.params.theme.name + ' ' +
					control.params.theme.description + ' ' +
					control.params.theme.tags + ' ' +
					control.params.theme.author + ' ';
			haystack = haystack.toLowerCase().replace( '-', ' ' );

			// Back-compat for behavior in WordPress 4.2.0 to 4.8.X.
			if ( ! _.isArray( terms ) ) {
				terms = [ terms ];
			}

			// Always give exact name matches highest ranking.
			if ( control.params.theme.name.toLowerCase() === terms.join( ' ' ) ) {
				matchCount = 100;
			} else {

				// Search for and weight (by 10) complete term matches.
				matchCount = matchCount + 10 * ( haystack.split( terms.join( ' ' ) ).length - 1 );

				// Search for each term individually (as whole-word and partial match) and sum weighted match counts.
				_.each( terms, function( term ) {
					matchCount = matchCount + 2 * ( haystack.split( term + ' ' ).length - 1 ); // Whole-word, double-weighted.
					matchCount = matchCount + haystack.split( term ).length - 1; // Partial word, to minimize empty intermediate searches while typing.
				});

				// Upper limit on match ranking.
				if ( matchCount > 99 ) {
					matchCount = 99;
				}
			}

			if ( 0 !== matchCount ) {
				control.activate();
				control.params.priority = 101 - matchCount; // Sort results by match count.
				return true;
			} else {
				control.deactivate(); // Hide control.
				control.params.priority = 101;
				return false;
			}
		},

		/**
		 * Rerender the theme from its JS template with the installed type.
		 *
		 * @since 4.9.0
		 *
		 * @return {void}
		 */
		rerenderAsInstalled: function( installed ) {
			var control = this, section;
			if ( installed ) {
				control.params.theme.type = 'installed';
			} else {
				section = api.section( control.params.section );
				control.params.theme.type = section.params.action;
			}
			control.renderContent(); // Replaces existing content.
			control.container.trigger( 'render-screenshot' );
		}
	});

	/**
	 * Class wp.customize.CodeEditorControl
	 *
	 * @since 4.9.0
	 *
	 * @class    wp.customize.CodeEditorControl
	 * @augments wp.customize.Control
	 */
	api.CodeEditorControl = api.Control.extend(/** @lends wp.customize.CodeEditorControl.prototype */{

		/**
		 * Initialize.
		 *
		 * @since 4.9.0
		 * @param {string} id      - Unique identifier for the control instance.
		 * @param {Object} options - Options hash for the control instance.
		 * @return {void}
		 */
		initialize: function( id, options ) {
			var control = this;
			control.deferred = _.extend( control.deferred || {}, {
				codemirror: $.Deferred()
			} );
			api.Control.prototype.initialize.call( control, id, options );

			// Note that rendering is debounced so the props will be used when rendering happens after add event.
			control.notifications.bind( 'add', function( notification ) {

				// Skip if control notification is not from setting csslint_error notification.
				if ( notification.code !== control.setting.id + ':csslint_error' ) {
					return;
				}

				// Customize the template and behavior of csslint_error notifications.
				notification.templateId = 'customize-code-editor-lint-error-notification';
				notification.render = (function( render ) {
					return function() {
						var li = render.call( this );
						li.find( 'input[type=checkbox]' ).on( 'click', function() {
							control.setting.notifications.remove( 'csslint_error' );
						} );
						return li;
					};
				})( notification.render );
			} );
		},

		/**
		 * Initialize the editor when the containing section is ready and expanded.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function() {
			var control = this;
			if ( ! control.section() ) {
				control.initEditor();
				return;
			}

			// Wait to initialize editor until section is embedded and expanded.
			api.section( control.section(), function( section ) {
				section.deferred.embedded.done( function() {
					var onceExpanded;
					if ( section.expanded() ) {
						control.initEditor();
					} else {
						onceExpanded = function( isExpanded ) {
							if ( isExpanded ) {
								control.initEditor();
								section.expanded.unbind( onceExpanded );
							}
						};
						section.expanded.bind( onceExpanded );
					}
				} );
			} );
		},

		/**
		 * Initialize editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		initEditor: function() {
			var control = this, element, editorSettings = false;

			// Obtain editorSettings for instantiation.
			if ( wp.codeEditor && ( _.isUndefined( control.params.editor_settings ) || false !== control.params.editor_settings ) ) {

				// Obtain default editor settings.
				editorSettings = wp.codeEditor.defaultSettings ? _.clone( wp.codeEditor.defaultSettings ) : {};
				editorSettings.codemirror = _.extend(
					{},
					editorSettings.codemirror,
					{
						indentUnit: 2,
						tabSize: 2
					}
				);

				// Merge editor_settings param on top of defaults.
				if ( _.isObject( control.params.editor_settings ) ) {
					_.each( control.params.editor_settings, function( value, key ) {
						if ( _.isObject( value ) ) {
							editorSettings[ key ] = _.extend(
								{},
								editorSettings[ key ],
								value
							);
						}
					} );
				}
			}

			element = new api.Element( control.container.find( 'textarea' ) );
			control.elements.push( element );
			element.sync( control.setting );
			element.set( control.setting() );

			if ( editorSettings ) {
				control.initSyntaxHighlightingEditor( editorSettings );
			} else {
				control.initPlainTextareaEditor();
			}
		},

		/**
		 * Make sure editor gets focused when control is focused.
		 *
		 * @since 4.9.0
		 * @param {Object}   [params] - Focus params.
		 * @param {Function} [params.completeCallback] - Function to call when expansion is complete.
		 * @return {void}
		 */
		focus: function( params ) {
			var control = this, extendedParams = _.extend( {}, params ), originalCompleteCallback;
			originalCompleteCallback = extendedParams.completeCallback;
			extendedParams.completeCallback = function() {
				if ( originalCompleteCallback ) {
					originalCompleteCallback();
				}
				if ( control.editor ) {
					control.editor.codemirror.focus();
				}
			};
			api.Control.prototype.focus.call( control, extendedParams );
		},

		/**
		 * Initialize syntax-highlighting editor.
		 *
		 * @since 4.9.0
		 * @param {Object} codeEditorSettings - Code editor settings.
		 * @return {void}
		 */
		initSyntaxHighlightingEditor: function( codeEditorSettings ) {
			var control = this, $textarea = control.container.find( 'textarea' ), settings, suspendEditorUpdate = false;

			settings = _.extend( {}, codeEditorSettings, {
				onTabNext: _.bind( control.onTabNext, control ),
				onTabPrevious: _.bind( control.onTabPrevious, control ),
				onUpdateErrorNotice: _.bind( control.onUpdateErrorNotice, control )
			});

			control.editor = wp.codeEditor.initialize( $textarea, settings );

			// Improve the editor accessibility.
			$( control.editor.codemirror.display.lineDiv )
				.attr({
					role: 'textbox',
					'aria-multiline': 'true',
					'aria-label': control.params.label,
					'aria-describedby': 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4'
				});

			// Focus the editor when clicking on its label.
			control.container.find( 'label' ).on( 'click', function() {
				control.editor.codemirror.focus();
			});

			/*
			 * When the CodeMirror instance changes, mirror to the textarea,
			 * where we have our "true" change event handler bound.
			 */
			control.editor.codemirror.on( 'change', function( codemirror ) {
				suspendEditorUpdate = true;
				$textarea.val( codemirror.getValue() ).trigger( 'change' );
				suspendEditorUpdate = false;
			});

			// Update CodeMirror when the setting is changed by another plugin.
			control.setting.bind( function( value ) {
				if ( ! suspendEditorUpdate ) {
					control.editor.codemirror.setValue( value );
				}
			});

			// Prevent collapsing section when hitting Esc to tab out of editor.
			control.editor.codemirror.on( 'keydown', function onKeydown( codemirror, event ) {
				var escKeyCode = 27;
				if ( escKeyCode === event.keyCode ) {
					event.stopPropagation();
				}
			});

			control.deferred.codemirror.resolveWith( control, [ control.editor.codemirror ] );
		},

		/**
		 * Handle tabbing to the field after the editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		onTabNext: function onTabNext() {
			var control = this, controls, controlIndex, section;
			section = api.section( control.section() );
			controls = section.controls();
			controlIndex = controls.indexOf( control );
			if ( controls.length === controlIndex + 1 ) {
				$( '#customize-footer-actions .collapse-sidebar' ).trigger( 'focus' );
			} else {
				controls[ controlIndex + 1 ].container.find( ':focusable:first' ).focus();
			}
		},

		/**
		 * Handle tabbing to the field before the editor.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		onTabPrevious: function onTabPrevious() {
			var control = this, controls, controlIndex, section;
			section = api.section( control.section() );
			controls = section.controls();
			controlIndex = controls.indexOf( control );
			if ( 0 === controlIndex ) {
				section.contentContainer.find( '.customize-section-title .customize-help-toggle, .customize-section-title .customize-section-description.open .section-description-close' ).last().focus();
			} else {
				controls[ controlIndex - 1 ].contentContainer.find( ':focusable:first' ).focus();
			}
		},

		/**
		 * Update error notice.
		 *
		 * @since 4.9.0
		 * @param {Array} errorAnnotations - Error annotations.
		 * @return {void}
		 */
		onUpdateErrorNotice: function onUpdateErrorNotice( errorAnnotations ) {
			var control = this, message;
			control.setting.notifications.remove( 'csslint_error' );

			if ( 0 !== errorAnnotations.length ) {
				if ( 1 === errorAnnotations.length ) {
					message = api.l10n.customCssError.singular.replace( '%d', '1' );
				} else {
					message = api.l10n.customCssError.plural.replace( '%d', String( errorAnnotations.length ) );
				}
				control.setting.notifications.add( new api.Notification( 'csslint_error', {
					message: message,
					type: 'error'
				} ) );
			}
		},

		/**
		 * Initialize plain-textarea editor when syntax highlighting is disabled.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		initPlainTextareaEditor: function() {
			var control = this, $textarea = control.container.find( 'textarea' ), textarea = $textarea[0];

			$textarea.on( 'blur', function onBlur() {
				$textarea.data( 'next-tab-blurs', false );
			} );

			$textarea.on( 'keydown', function onKeydown( event ) {
				var selectionStart, selectionEnd, value, tabKeyCode = 9, escKeyCode = 27;

				if ( escKeyCode === event.keyCode ) {
					if ( ! $textarea.data( 'next-tab-blurs' ) ) {
						$textarea.data( 'next-tab-blurs', true );
						event.stopPropagation(); // Prevent collapsing the section.
					}
					return;
				}

				// Short-circuit if tab key is not being pressed or if a modifier key *is* being pressed.
				if ( tabKeyCode !== event.keyCode || event.ctrlKey || event.altKey || event.shiftKey ) {
					return;
				}

				// Prevent capturing Tab characters if Esc was pressed.
				if ( $textarea.data( 'next-tab-blurs' ) ) {
					return;
				}

				selectionStart = textarea.selectionStart;
				selectionEnd = textarea.selectionEnd;
				value = textarea.value;

				if ( selectionStart >= 0 ) {
					textarea.value = value.substring( 0, selectionStart ).concat( '\t', value.substring( selectionEnd ) );
					$textarea.selectionStart = textarea.selectionEnd = selectionStart + 1;
				}

				event.stopPropagation();
				event.preventDefault();
			});

			control.deferred.codemirror.rejectWith( control );
		}
	});

	/**
	 * Class wp.customize.DateTimeControl.
	 *
	 * @since 4.9.0
	 * @class    wp.customize.DateTimeControl
	 * @augments wp.customize.Control
	 */
	api.DateTimeControl = api.Control.extend(/** @lends wp.customize.DateTimeControl.prototype */{

		/**
		 * Initialize behaviors.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function ready() {
			var control = this;

			control.inputElements = {};
			control.invalidDate = false;

			_.bindAll( control, 'populateSetting', 'updateDaysForMonth', 'populateDateInputs' );

			if ( ! control.setting ) {
				throw new Error( 'Missing setting' );
			}

			control.container.find( '.date-input' ).each( function() {
				var input = $( this ), component, element;
				component = input.data( 'component' );
				element = new api.Element( input );
				control.inputElements[ component ] = element;
				control.elements.push( element );

				// Add invalid date error once user changes (and has blurred the input).
				input.on( 'change', function() {
					if ( control.invalidDate ) {
						control.notifications.add( new api.Notification( 'invalid_date', {
							message: api.l10n.invalidDate
						} ) );
					}
				} );

				// Remove the error immediately after validity change.
				input.on( 'input', _.debounce( function() {
					if ( ! control.invalidDate ) {
						control.notifications.remove( 'invalid_date' );
					}
				} ) );

				// Add zero-padding when blurring field.
				input.on( 'blur', _.debounce( function() {
					if ( ! control.invalidDate ) {
						control.populateDateInputs();
					}
				} ) );
			} );

			control.inputElements.month.bind( control.updateDaysForMonth );
			control.inputElements.year.bind( control.updateDaysForMonth );
			control.populateDateInputs();
			control.setting.bind( control.populateDateInputs );

			// Start populating setting after inputs have been populated.
			_.each( control.inputElements, function( element ) {
				element.bind( control.populateSetting );
			} );
		},

		/**
		 * Parse datetime string.
		 *
		 * @since 4.9.0
		 *
		 * @param {string} datetime - Date/Time string. Accepts Y-m-d[ H:i[:s]] format.
		 * @return {Object|null} Returns object containing date components or null if parse error.
		 */
		parseDateTime: function parseDateTime( datetime ) {
			var control = this, matches, date, midDayHour = 12;

			if ( datetime ) {
				matches = datetime.match( /^(\d\d\d\d)-(\d\d)-(\d\d)(?: (\d\d):(\d\d)(?::(\d\d))?)?$/ );
			}

			if ( ! matches ) {
				return null;
			}

			matches.shift();

			date = {
				year: matches.shift(),
				month: matches.shift(),
				day: matches.shift(),
				hour: matches.shift() || '00',
				minute: matches.shift() || '00',
				second: matches.shift() || '00'
			};

			if ( control.params.includeTime && control.params.twelveHourFormat ) {
				date.hour = parseInt( date.hour, 10 );
				date.meridian = date.hour >= midDayHour ? 'pm' : 'am';
				date.hour = date.hour % midDayHour ? String( date.hour % midDayHour ) : String( midDayHour );
				delete date.second; // @todo Why only if twelveHourFormat?
			}

			return date;
		},

		/**
		 * Validates if input components have valid date and time.
		 *
		 * @since 4.9.0
		 * @return {boolean} If date input fields has error.
		 */
		validateInputs: function validateInputs() {
			var control = this, components, validityInput;

			control.invalidDate = false;

			components = [ 'year', 'day' ];
			if ( control.params.includeTime ) {
				components.push( 'hour', 'minute' );
			}

			_.find( components, function( component ) {
				var element, max, min, value;

				element = control.inputElements[ component ];
				validityInput = element.element.get( 0 );
				max = parseInt( element.element.attr( 'max' ), 10 );
				min = parseInt( element.element.attr( 'min' ), 10 );
				value = parseInt( element(), 10 );
				control.invalidDate = isNaN( value ) || value > max || value < min;

				if ( ! control.invalidDate ) {
					validityInput.setCustomValidity( '' );
				}

				return control.invalidDate;
			} );

			if ( control.inputElements.meridian && ! control.invalidDate ) {
				validityInput = control.inputElements.meridian.element.get( 0 );
				if ( 'am' !== control.inputElements.meridian.get() && 'pm' !== control.inputElements.meridian.get() ) {
					control.invalidDate = true;
				} else {
					validityInput.setCustomValidity( '' );
				}
			}

			if ( control.invalidDate ) {
				validityInput.setCustomValidity( api.l10n.invalidValue );
			} else {
				validityInput.setCustomValidity( '' );
			}
			if ( ! control.section() || api.section.has( control.section() ) && api.section( control.section() ).expanded() ) {
				_.result( validityInput, 'reportValidity' );
			}

			return control.invalidDate;
		},

		/**
		 * Updates number of days according to the month and year selected.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		updateDaysForMonth: function updateDaysForMonth() {
			var control = this, daysInMonth, year, month, day;

			month = parseInt( control.inputElements.month(), 10 );
			year = parseInt( control.inputElements.year(), 10 );
			day = parseInt( control.inputElements.day(), 10 );

			if ( month && year ) {
				daysInMonth = new Date( year, month, 0 ).getDate();
				control.inputElements.day.element.attr( 'max', daysInMonth );

				if ( day > daysInMonth ) {
					control.inputElements.day( String( daysInMonth ) );
				}
			}
		},

		/**
		 * Populate setting value from the inputs.
		 *
		 * @since 4.9.0
		 * @return {boolean} If setting updated.
		 */
		populateSetting: function populateSetting() {
			var control = this, date;

			if ( control.validateInputs() || ! control.params.allowPastDate && ! control.isFutureDate() ) {
				return false;
			}

			date = control.convertInputDateToString();
			control.setting.set( date );
			return true;
		},

		/**
		 * Converts input values to string in Y-m-d H:i:s format.
		 *
		 * @since 4.9.0
		 * @return {string} Date string.
		 */
		convertInputDateToString: function convertInputDateToString() {
			var control = this, date = '', dateFormat, hourInTwentyFourHourFormat,
				getElementValue, pad;

			pad = function( number, padding ) {
				var zeros;
				if ( String( number ).length < padding ) {
					zeros = padding - String( number ).length;
					number = Math.pow( 10, zeros ).toString().substr( 1 ) + String( number );
				}
				return number;
			};

			getElementValue = function( component ) {
				var value = parseInt( control.inputElements[ component ].get(), 10 );

				if ( _.contains( [ 'month', 'day', 'hour', 'minute' ], component ) ) {
					value = pad( value, 2 );
				} else if ( 'year' === component ) {
					value = pad( value, 4 );
				}
				return value;
			};

			dateFormat = [ 'year', '-', 'month', '-', 'day' ];
			if ( control.params.includeTime ) {
				hourInTwentyFourHourFormat = control.inputElements.meridian ? control.convertHourToTwentyFourHourFormat( control.inputElements.hour(), control.inputElements.meridian() ) : control.inputElements.hour();
				dateFormat = dateFormat.concat( [ ' ', pad( hourInTwentyFourHourFormat, 2 ), ':', 'minute', ':', '00' ] );
			}

			_.each( dateFormat, function( component ) {
				date += control.inputElements[ component ] ? getElementValue( component ) : component;
			} );

			return date;
		},

		/**
		 * Check if the date is in the future.
		 *
		 * @since 4.9.0
		 * @return {boolean} True if future date.
		 */
		isFutureDate: function isFutureDate() {
			var control = this;
			return 0 < api.utils.getRemainingTime( control.convertInputDateToString() );
		},

		/**
		 * Convert hour in twelve hour format to twenty four hour format.
		 *
		 * @since 4.9.0
		 * @param {string} hourInTwelveHourFormat - Hour in twelve hour format.
		 * @param {string} meridian - Either 'am' or 'pm'.
		 * @return {string} Hour in twenty four hour format.
		 */
		convertHourToTwentyFourHourFormat: function convertHour( hourInTwelveHourFormat, meridian ) {
			var hourInTwentyFourHourFormat, hour, midDayHour = 12;

			hour = parseInt( hourInTwelveHourFormat, 10 );
			if ( isNaN( hour ) ) {
				return '';
			}

			if ( 'pm' === meridian && hour < midDayHour ) {
				hourInTwentyFourHourFormat = hour + midDayHour;
			} else if ( 'am' === meridian && midDayHour === hour ) {
				hourInTwentyFourHourFormat = hour - midDayHour;
			} else {
				hourInTwentyFourHourFormat = hour;
			}

			return String( hourInTwentyFourHourFormat );
		},

		/**
		 * Populates date inputs in date fields.
		 *
		 * @since 4.9.0
		 * @return {boolean} Whether the inputs were populated.
		 */
		populateDateInputs: function populateDateInputs() {
			var control = this, parsed;

			parsed = control.parseDateTime( control.setting.get() );

			if ( ! parsed ) {
				return false;
			}

			_.each( control.inputElements, function( element, component ) {
				var value = parsed[ component ]; // This will be zero-padded string.

				// Set month and meridian regardless of focused state since they are dropdowns.
				if ( 'month' === component || 'meridian' === component ) {

					// Options in dropdowns are not zero-padded.
					value = value.replace( /^0/, '' );

					element.set( value );
				} else {

					value = parseInt( value, 10 );
					if ( ! element.element.is( document.activeElement ) ) {

						// Populate element with zero-padded value if not focused.
						element.set( parsed[ component ] );
					} else if ( value !== parseInt( element(), 10 ) ) {

						// Forcibly update the value if its underlying value changed, regardless of zero-padding.
						element.set( String( value ) );
					}
				}
			} );

			return true;
		},

		/**
		 * Toggle future date notification for date control.
		 *
		 * @since 4.9.0
		 * @param {boolean} notify Add or remove the notification.
		 * @return {wp.customize.DateTimeControl}
		 */
		toggleFutureDateNotification: function toggleFutureDateNotification( notify ) {
			var control = this, notificationCode, notification;

			notificationCode = 'not_future_date';

			if ( notify ) {
				notification = new api.Notification( notificationCode, {
					type: 'error',
					message: api.l10n.futureDateError
				} );
				control.notifications.add( notification );
			} else {
				control.notifications.remove( notificationCode );
			}

			return control;
		}
	});

	/**
	 * Class PreviewLinkControl.
	 *
	 * @since 4.9.0
	 * @class    wp.customize.PreviewLinkControl
	 * @augments wp.customize.Control
	 */
	api.PreviewLinkControl = api.Control.extend(/** @lends wp.customize.PreviewLinkControl.prototype */{

		defaults: _.extend( {}, api.Control.prototype.defaults, {
			templateId: 'customize-preview-link-control'
		} ),

		/**
		 * Initialize behaviors.
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		ready: function ready() {
			var control = this, element, component, node, url, input, button;

			_.bindAll( control, 'updatePreviewLink' );

			if ( ! control.setting ) {
			    control.setting = new api.Value();
			}

			control.previewElements = {};

			control.container.find( '.preview-control-element' ).each( function() {
				node = $( this );
				component = node.data( 'component' );
				element = new api.Element( node );
				control.previewElements[ component ] = element;
				control.elements.push( element );
			} );

			url = control.previewElements.url;
			input = control.previewElements.input;
			button = control.previewElements.button;

			input.link( control.setting );
			url.link( control.setting );

			url.bind( function( value ) {
				url.element.parent().attr( {
					href: value,
					target: api.settings.changeset.uuid
				} );
			} );

			api.bind( 'ready', control.updatePreviewLink );
			api.state( 'saved' ).bind( control.updatePreviewLink );
			api.state( 'changesetStatus' ).bind( control.updatePreviewLink );
			api.state( 'activated' ).bind( control.updatePreviewLink );
			api.previewer.previewUrl.bind( control.updatePreviewLink );

			button.element.on( 'click', function( event ) {
				event.preventDefault();
				if ( control.setting() ) {
					input.element.select();
					document.execCommand( 'copy' );
					button( button.element.data( 'copied-text' ) );
				}
			} );

			url.element.parent().on( 'click', function( event ) {
				if ( $( this ).hasClass( 'disabled' ) ) {
					event.preventDefault();
				}
			} );

			button.element.on( 'mouseenter', function() {
				if ( control.setting() ) {
					button( button.element.data( 'copy-text' ) );
				}
			} );
		},

		/**
		 * Updates Preview Link
		 *
		 * @since 4.9.0
		 * @return {void}
		 */
		updatePreviewLink: function updatePreviewLink() {
			var control = this, unsavedDirtyValues;

			unsavedDirtyValues = ! api.state( 'saved' ).get() || '' === api.state( 'changesetStatus' ).get() || 'auto-draft' === api.state( 'changesetStatus' ).get();

			control.toggleSaveNotification( unsavedDirtyValues );
			control.previewElements.url.element.parent().toggleClass( 'disabled', unsavedDirtyValues );
			control.previewElements.button.element.prop( 'disabled', unsavedDirtyValues );
			control.setting.set( api.previewer.getFrontendPreviewUrl() );
		},

		/**
		 * Toggles save notification.
		 *
		 * @since 4.9.0
		 * @param {boolean} notify Add or remove notification.
		 * @return {void}
		 */
		toggleSaveNotification: function toggleSaveNotification( notify ) {
			var control = this, notificationCode, notification;

			notificationCode = 'changes_not_saved';

			if ( notify ) {
				notification = new api.Notification( notificationCode, {
					type: 'info',
					message: api.l10n.saveBeforeShare
				} );
				control.notifications.add( notification );
			} else {
				control.notifications.remove( notificationCode );
			}
		}
	});

	/**
	 * Change objects contained within the main customize object to Settings.
	 *
	 * @alias wp.customize.defaultConstructor
	 */
	api.defaultConstructor = api.Setting;

	/**
	 * Callback for resolved controls.
	 *
	 * @callback wp.customize.deferredControlsCallback
	 * @param {wp.customize.Control[]} controls Resolved controls.
	 */

	/**
	 * Collection of all registered controls.
	 *
	 * @alias wp.customize.control
	 *
	 * @since 3.4.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for controls to obtain.
	 * @param {deferredControlsCallback} [callback] - Function called when all supplied controls exist.
	 * @return {wp.customize.Control|undefined|jQuery.promise} Control instance or undefined (if function called with one id param),
	 *                                                         or promise resolving to requested controls.
	 *
	 * @example <caption>Loop over all registered controls.</caption>
	 * wp.customize.control.each( function( control ) { ... } );
	 *
	 * @example <caption>Getting `background_color` control instance.</caption>
	 * control = wp.customize.control( 'background_color' );
	 *
	 * @example <caption>Check if control exists.</caption>
	 * hasControl = wp.customize.control.has( 'background_color' );
	 *
	 * @example <caption>Deferred getting of `background_color` control until it exists, using callback.</caption>
	 * wp.customize.control( 'background_color', function( control ) { ... } );
	 *
	 * @example <caption>Get title and tagline controls when they both exist, using promise (only available when multiple IDs are present).</caption>
	 * promise = wp.customize.control( 'blogname', 'blogdescription' );
	 * promise.done( function( titleControl, taglineControl ) { ... } );
	 *
	 * @example <caption>Get title and tagline controls when they both exist, using callback.</caption>
	 * wp.customize.control( 'blogname', 'blogdescription', function( titleControl, taglineControl ) { ... } );
	 *
	 * @example <caption>Getting setting value for `background_color` control.</caption>
	 * value = wp.customize.control( 'background_color ').setting.get();
	 * value = wp.customize( 'background_color' ).get(); // Same as above, since setting ID and control ID are the same.
	 *
	 * @example <caption>Add new control for site title.</caption>
	 * wp.customize.control.add( new wp.customize.Control( 'other_blogname', {
	 *     setting: 'blogname',
	 *     type: 'text',
	 *     label: 'Site title',
	 *     section: 'other_site_identify'
	 * } ) );
	 *
	 * @example <caption>Remove control.</caption>
	 * wp.customize.control.remove( 'other_blogname' );
	 *
	 * @example <caption>Listen for control being added.</caption>
	 * wp.customize.control.bind( 'add', function( addedControl ) { ... } )
	 *
	 * @example <caption>Listen for control being removed.</caption>
	 * wp.customize.control.bind( 'removed', function( removedControl ) { ... } )
	 */
	api.control = new api.Values({ defaultConstructor: api.Control });

	/**
	 * Callback for resolved sections.
	 *
	 * @callback wp.customize.deferredSectionsCallback
	 * @param {wp.customize.Section[]} sections Resolved sections.
	 */

	/**
	 * Collection of all registered sections.
	 *
	 * @alias wp.customize.section
	 *
	 * @since 3.4.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for sections to obtain.
	 * @param {deferredSectionsCallback} [callback] - Function called when all supplied sections exist.
	 * @return {wp.customize.Section|undefined|jQuery.promise} Section instance or undefined (if function called with one id param),
	 *                                                         or promise resolving to requested sections.
	 *
	 * @example <caption>Loop over all registered sections.</caption>
	 * wp.customize.section.each( function( section ) { ... } )
	 *
	 * @example <caption>Getting `title_tagline` section instance.</caption>
	 * section = wp.customize.section( 'title_tagline' )
	 *
	 * @example <caption>Expand dynamically-created section when it exists.</caption>
	 * wp.customize.section( 'dynamically_created', function( section ) {
	 *     section.expand();
	 * } );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.section = new api.Values({ defaultConstructor: api.Section });

	/**
	 * Callback for resolved panels.
	 *
	 * @callback wp.customize.deferredPanelsCallback
	 * @param {wp.customize.Panel[]} panels Resolved panels.
	 */

	/**
	 * Collection of all registered panels.
	 *
	 * @alias wp.customize.panel
	 *
	 * @since 4.0.0
	 *
	 * @type {Function}
	 * @param {...string} ids - One or more ids for panels to obtain.
	 * @param {deferredPanelsCallback} [callback] - Function called when all supplied panels exist.
	 * @return {wp.customize.Panel|undefined|jQuery.promise} Panel instance or undefined (if function called with one id param),
	 *                                                       or promise resolving to requested panels.
	 *
	 * @example <caption>Loop over all registered panels.</caption>
	 * wp.customize.panel.each( function( panel ) { ... } )
	 *
	 * @example <caption>Getting nav_menus panel instance.</caption>
	 * panel = wp.customize.panel( 'nav_menus' );
	 *
	 * @example <caption>Expand dynamically-created panel when it exists.</caption>
	 * wp.customize.panel( 'dynamically_created', function( panel ) {
	 *     panel.expand();
	 * } );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.panel = new api.Values({ defaultConstructor: api.Panel });

	/**
	 * Callback for resolved notifications.
	 *
	 * @callback wp.customize.deferredNotificationsCallback
	 * @param {wp.customize.Notification[]} notifications Resolved notifications.
	 */

	/**
	 * Collection of all global notifications.
	 *
	 * @alias wp.customize.notifications
	 *
	 * @since 4.9.0
	 *
	 * @type {Function}
	 * @param {...string} codes - One or more codes for notifications to obtain.
	 * @param {deferredNotificationsCallback} [callback] - Function called when all supplied notifications exist.
	 * @return {wp.customize.Notification|undefined|jQuery.promise} Notification instance or undefined (if function called with one code param),
	 *                                                              or promise resolving to requested notifications.
	 *
	 * @example <caption>Check if existing notification</caption>
	 * exists = wp.customize.notifications.has( 'a_new_day_arrived' );
	 *
	 * @example <caption>Obtain existing notification</caption>
	 * notification = wp.customize.notifications( 'a_new_day_arrived' );
	 *
	 * @example <caption>Obtain notification that may not exist yet.</caption>
	 * wp.customize.notifications( 'a_new_day_arrived', function( notification ) { ... } );
	 *
	 * @example <caption>Add a warning notification.</caption>
	 * wp.customize.notifications.add( new wp.customize.Notification( 'midnight_almost_here', {
	 *     type: 'warning',
	 *     message: 'Midnight has almost arrived!',
	 *     dismissible: true
	 * } ) );
	 *
	 * @example <caption>Remove a notification.</caption>
	 * wp.customize.notifications.remove( 'a_new_day_arrived' );
	 *
	 * @see {@link wp.customize.control} for further examples of how to interact with {@link wp.customize.Values} instances.
	 */
	api.notifications = new api.Notifications();

	api.PreviewFrame = api.Messenger.extend(/** @lends wp.customize.PreviewFrame.prototype */{
		sensitivity: null, // Will get set to api.settings.timeouts.previewFrameSensitivity.

		/**
		 * An object that fetches a preview in the background of the document, which
		 * allows for seamless replacement of an existing preview.
		 *
		 * @constructs wp.customize.PreviewFrame
		 * @augments   wp.customize.Messenger
		 *
		 * @param {Object} params.container
		 * @param {Object} params.previewUrl
		 * @param {Object} params.query
		 * @param {Object} options
		 */
		initialize: function( params, options ) {
			var deferred = $.Deferred();

			/*
			 * Make the instance of the PreviewFrame the promise object
			 * so other objects can easily interact with it.
			 */
			deferred.promise( this );

			this.container = params.container;

			$.extend( params, { channel: api.PreviewFrame.uuid() });

			api.Messenger.prototype.initialize.call( this, params, options );

			this.add( 'previewUrl', params.previewUrl );

			this.query = $.extend( params.query || {}, { customize_messenger_channel: this.channel() });

			this.run( deferred );
		},

		/**
		 * Run the preview request.
		 *
		 * @param {Object} deferred jQuery Deferred object to be resolved with
		 *                          the request.
		 */
		run: function( deferred ) {
			var previewFrame = this,
				loaded = false,
				ready = false,
				readyData = null,
				hasPendingChangesetUpdate = '{}' !== previewFrame.query.customized,
				urlParser,
				params,
				form;

			if ( previewFrame._ready ) {
				previewFrame.unbind( 'ready', previewFrame._ready );
			}

			previewFrame._ready = function( data ) {
				ready = true;
				readyData = data;
				previewFrame.container.addClass( 'iframe-ready' );
				if ( ! data ) {
					return;
				}

				if ( loaded ) {
					deferred.resolveWith( previewFrame, [ data ] );
				}
			};

			previewFrame.bind( 'ready', previewFrame._ready );

			urlParser = document.createElement( 'a' );
			urlParser.href = previewFrame.previewUrl();

			params = _.extend(
				api.utils.parseQueryString( urlParser.search.substr( 1 ) ),
				{
					customize_changeset_uuid: previewFrame.query.customize_changeset_uuid,
					customize_theme: previewFrame.query.customize_theme,
					customize_messenger_channel: previewFrame.query.customize_messenger_channel
				}
			);
			if ( api.settings.changeset.autosaved || ! api.state( 'saved' ).get() ) {
				params.customize_autosaved = 'on';
			}

			urlParser.search = $.param( params );
			previewFrame.iframe = $( '<iframe />', {
				title: api.l10n.previewIframeTitle,
				name: 'customize-' + previewFrame.channel()
			} );
			previewFrame.iframe.attr( 'onmousewheel', '' ); // Workaround for Safari bug. See WP Trac #38149.
			previewFrame.iframe.attr( 'sandbox', 'allow-forms allow-modals allow-orientation-lock allow-pointer-lock allow-popups allow-popups-to-escape-sandbox allow-presentation allow-same-origin allow-scripts' );

			if ( ! hasPendingChangesetUpdate ) {
				previewFrame.iframe.attr( 'src', urlParser.href );
			} else {
				previewFrame.iframe.attr( 'data-src', urlParser.href ); // For debugging purposes.
			}

			previewFrame.iframe.appendTo( previewFrame.container );
			previewFrame.targetWindow( previewFrame.iframe[0].contentWindow );

			/*
			 * Submit customized data in POST request to preview frame window since
			 * there are setting value changes not yet written to changeset.
			 */
			if ( hasPendingChangesetUpdate ) {
				form = $( '<form>', {
					action: urlParser.href,
					target: previewFrame.iframe.attr( 'name' ),
					method: 'post',
					hidden: 'hidden'
				} );
				form.append( $( '<input>', {
					type: 'hidden',
					name: '_method',
					value: 'GET'
				} ) );
				_.each( previewFrame.query, function( value, key ) {
					form.append( $( '<input>', {
						type: 'hidden',
						name: key,
						value: value
					} ) );
				} );
				previewFrame.container.append( form );
				form.trigger( 'submit' );
				form.remove(); // No need to keep the form around after submitted.
			}

			previewFrame.bind( 'iframe-loading-error', function( error ) {
				previewFrame.iframe.remove();

				// Check if the user is not logged in.
				if ( 0 === error ) {
					previewFrame.login( deferred );
					return;
				}

				// Check for cheaters.
				if ( -1 === error ) {
					deferred.rejectWith( previewFrame, [ 'cheatin' ] );
					return;
				}

				deferred.rejectWith( previewFrame, [ 'request failure' ] );
			} );

			previewFrame.iframe.one( 'load', function() {
				loaded = true;

				if ( ready ) {
					deferred.resolveWith( previewFrame, [ readyData ] );
				} else {
					setTimeout( function() {
						deferred.rejectWith( previewFrame, [ 'ready timeout' ] );
					}, previewFrame.sensitivity );
				}
			});
		},

		login: function( deferred ) {
			var self = this,
				reject;

			reject = function() {
				deferred.rejectWith( self, [ 'logged out' ] );
			};

			if ( this.triedLogin ) {
				return reject();
			}

			// Check if we have an admin cookie.
			$.get( api.settings.url.ajax, {
				action: 'logged-in'
			}).fail( reject ).done( function( response ) {
				var iframe;

				if ( '1' !== response ) {
					reject();
				}

				iframe = $( '<iframe />', { 'src': self.previewUrl(), 'title': api.l10n.previewIframeTitle } ).hide();
				iframe.appendTo( self.container );
				iframe.on( 'load', function() {
					self.triedLogin = true;

					iframe.remove();
					self.run( deferred );
				});
			});
		},

		destroy: function() {
			api.Messenger.prototype.destroy.call( this );

			if ( this.iframe ) {
				this.iframe.remove();
			}

			delete this.iframe;
			delete this.targetWindow;
		}
	});

	(function(){
		var id = 0;
		/**
		 * Return an incremented ID for a preview messenger channel.
		 *
		 * This function is named "uuid" for historical reasons, but it is a
		 * misnomer as it is not an actual UUID, and it is not universally unique.
		 * This is not to be confused with `api.settings.changeset.uuid`.
		 *
		 * @return {string}
		 */
		api.PreviewFrame.uuid = function() {
			return 'preview-' + String( id++ );
		};
	}());

	/**
	 * Set the document title of the customizer.
	 *
	 * @alias wp.customize.setDocumentTitle
	 *
	 * @since 4.1.0
	 *
	 * @param {string} documentTitle
	 */
	api.setDocumentTitle = function ( documentTitle ) {
		var tmpl, title;
		tmpl = api.settings.documentTitleTmpl;
		title = tmpl.replace( '%s', documentTitle );
		document.title = title;
		api.trigger( 'title', title );
	};

	api.Previewer = api.Messenger.extend(/** @lends wp.customize.Previewer.prototype */{
		refreshBuffer: null, // Will get set to api.settings.timeouts.windowRefresh.

		/**
		 * @constructs wp.customize.Previewer
		 * @augments   wp.customize.Messenger
		 *
		 * @param {Array}  params.allowedUrls
		 * @param {string} params.container   A selector or jQuery element for the preview
		 *                                    frame to be placed.
		 * @param {string} params.form
		 * @param {string} params.previewUrl  The URL to preview.
		 * @param {Object} options
		 */
		initialize: function( params, options ) {
			var previewer = this,
				urlParser = document.createElement( 'a' );

			$.extend( previewer, options || {} );
			previewer.deferred = {
				active: $.Deferred()
			};

			// Debounce to prevent hammering server and then wait for any pending update requests.
			previewer.refresh = _.debounce(
				( function( originalRefresh ) {
					return function() {
						var isProcessingComplete, refreshOnceProcessingComplete;
						isProcessingComplete = function() {
							return 0 === api.state( 'processing' ).get();
						};
						if ( isProcessingComplete() ) {
							originalRefresh.call( previewer );
						} else {
							refreshOnceProcessingComplete = function() {
								if ( isProcessingComplete() ) {
									originalRefresh.call( previewer );
									api.state( 'processing' ).unbind( refreshOnceProcessingComplete );
								}
							};
							api.state( 'processing' ).bind( refreshOnceProcessingComplete );
						}
					};
				}( previewer.refresh ) ),
				previewer.refreshBuffer
			);

			previewer.container   = api.ensure( params.container );
			previewer.allowedUrls = params.allowedUrls;

			params.url = window.location.href;

			api.Messenger.prototype.initialize.call( previewer, params );

			urlParser.href = previewer.origin();
			previewer.add( 'scheme', urlParser.protocol.replace( /:$/, '' ) );

			/*
			 * Limit the URL to internal, front-end links.
			 *
			 * If the front end and the admin are served from the same domain, load the
			 * preview over ssl if the Customizer is being loaded over ssl. This avoids
			 * insecure content warnings. This is not attempted if the admin and front end
			 * are on different domains to avoid the case where the front end doesn't have
			 * ssl certs.
			 */

			previewer.add( 'previewUrl', params.previewUrl ).setter( function( to ) {
				var result = null, urlParser, queryParams, parsedAllowedUrl, parsedCandidateUrls = [];
				urlParser = document.createElement( 'a' );
				urlParser.href = to;

				// Abort if URL is for admin or (static) files in wp-includes or wp-content.
				if ( /\/wp-(admin|includes|content)(\/|$)/.test( urlParser.pathname ) ) {
					return null;
				}

				// Remove state query params.
				if ( urlParser.search.length > 1 ) {
					queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
					delete queryParams.customize_changeset_uuid;
					delete queryParams.customize_theme;
					delete queryParams.customize_messenger_channel;
					delete queryParams.customize_autosaved;
					if ( _.isEmpty( queryParams ) ) {
						urlParser.search = '';
					} else {
						urlParser.search = $.param( queryParams );
					}
				}

				parsedCandidateUrls.push( urlParser );

				// Prepend list with URL that matches the scheme/protocol of the iframe.
				if ( previewer.scheme.get() + ':' !== urlParser.protocol ) {
					urlParser = document.createElement( 'a' );
					urlParser.href = parsedCandidateUrls[0].href;
					urlParser.protocol = previewer.scheme.get() + ':';
					parsedCandidateUrls.unshift( urlParser );
				}

				// Attempt to match the URL to the control frame's scheme and check if it's allowed. If not, try the original URL.
				parsedAllowedUrl = document.createElement( 'a' );
				_.find( parsedCandidateUrls, function( parsedCandidateUrl ) {
					return ! _.isUndefined( _.find( previewer.allowedUrls, function( allowedUrl ) {
						parsedAllowedUrl.href = allowedUrl;
						if ( urlParser.protocol === parsedAllowedUrl.protocol && urlParser.host === parsedAllowedUrl.host && 0 === urlParser.pathname.indexOf( parsedAllowedUrl.pathname.replace( /\/$/, '' ) ) ) {
							result = parsedCandidateUrl.href;
							return true;
						}
					} ) );
				} );

				return result;
			});

			previewer.bind( 'ready', previewer.ready );

			// Start listening for keep-alive messages when iframe first loads.
			previewer.deferred.active.done( _.bind( previewer.keepPreviewAlive, previewer ) );

			previewer.bind( 'synced', function() {
				previewer.send( 'active' );
			} );

			// Refresh the preview when the URL is changed (but not yet).
			previewer.previewUrl.bind( previewer.refresh );

			previewer.scroll = 0;
			previewer.bind( 'scroll', function( distance ) {
				previewer.scroll = distance;
			});

			// Update the URL when the iframe sends a URL message, resetting scroll position. If URL is unchanged, then refresh.
			previewer.bind( 'url', function( url ) {
				var onUrlChange, urlChanged = false;
				previewer.scroll = 0;
				onUrlChange = function() {
					urlChanged = true;
				};
				previewer.previewUrl.bind( onUrlChange );
				previewer.previewUrl.set( url );
				previewer.previewUrl.unbind( onUrlChange );
				if ( ! urlChanged ) {
					previewer.refresh();
				}
			} );

			// Update the document title when the preview changes.
			previewer.bind( 'documentTitle', function ( title ) {
				api.setDocumentTitle( title );
			} );
		},

		/**
		 * Handle the preview receiving the ready message.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @param {Object} data - Data from preview.
		 * @param {string} data.currentUrl - Current URL.
		 * @param {Object} data.activePanels - Active panels.
		 * @param {Object} data.activeSections Active sections.
		 * @param {Object} data.activeControls Active controls.
		 * @return {void}
		 */
		ready: function( data ) {
			var previewer = this, synced = {}, constructs;

			synced.settings = api.get();
			synced['settings-modified-while-loading'] = previewer.settingsModifiedWhileLoading;
			if ( 'resolved' !== previewer.deferred.active.state() || previewer.loading ) {
				synced.scroll = previewer.scroll;
			}
			synced['edit-shortcut-visibility'] = api.state( 'editShortcutVisibility' ).get();
			previewer.send( 'sync', synced );

			// Set the previewUrl without causing the url to set the iframe.
			if ( data.currentUrl ) {
				previewer.previewUrl.unbind( previewer.refresh );
				previewer.previewUrl.set( data.currentUrl );
				previewer.previewUrl.bind( previewer.refresh );
			}

			/*
			 * Walk over all panels, sections, and controls and set their
			 * respective active states to true if the preview explicitly
			 * indicates as such.
			 */
			constructs = {
				panel: data.activePanels,
				section: data.activeSections,
				control: data.activeControls
			};
			_( constructs ).each( function ( activeConstructs, type ) {
				api[ type ].each( function ( construct, id ) {
					var isDynamicallyCreated = _.isUndefined( api.settings[ type + 's' ][ id ] );

					/*
					 * If the construct was created statically in PHP (not dynamically in JS)
					 * then consider a missing (undefined) value in the activeConstructs to
					 * mean it should be deactivated (since it is gone). But if it is
					 * dynamically created then only toggle activation if the value is defined,
					 * as this means that the construct was also then correspondingly
					 * created statically in PHP and the active callback is available.
					 * Otherwise, dynamically-created constructs should normally have
					 * their active states toggled in JS rather than from PHP.
					 */
					if ( ! isDynamicallyCreated || ! _.isUndefined( activeConstructs[ id ] ) ) {
						if ( activeConstructs[ id ] ) {
							construct.activate();
						} else {
							construct.deactivate();
						}
					}
				} );
			} );

			if ( data.settingValidities ) {
				api._handleSettingValidities( {
					settingValidities: data.settingValidities,
					focusInvalidControl: false
				} );
			}
		},

		/**
		 * Keep the preview alive by listening for ready and keep-alive messages.
		 *
		 * If a message is not received in the allotted time then the iframe will be set back to the last known valid URL.
		 *
		 * @since 4.7.0
		 * @access public
		 *
		 * @return {void}
		 */
		keepPreviewAlive: function keepPreviewAlive() {
			var previewer = this, keepAliveTick, timeoutId, handleMissingKeepAlive, scheduleKeepAliveCheck;

			/**
			 * Schedule a preview keep-alive check.
			 *
			 * Note that if a page load takes longer than keepAliveCheck milliseconds,
			 * the keep-alive messages will still be getting sent from the previous
			 * URL.
			 */
			scheduleKeepAliveCheck = function() {
				timeoutId = setTimeout( handleMissingKeepAlive, api.settings.timeouts.keepAliveCheck );
			};

			/**
			 * Set the previewerAlive state to true when receiving a message from the preview.
			 */
			keepAliveTick = function() {
				api.state( 'previewerAlive' ).set( true );
				clearTimeout( timeoutId );
				scheduleKeepAliveCheck();
			};

			/**
			 * Set the previewerAlive state to false if keepAliveCheck milliseconds have transpired without a message.
			 *
			 * This is most likely to happen in the case of a connectivity error, or if the theme causes the browser
			 * to navigate to a non-allowed URL. Setting this state to false will force settings with a postMessage
			 * transport to use refresh instead, causing the preview frame also to be replaced with the current
			 * allowed preview URL.
			 */
			handleMissingKeepAlive = function() {
				api.state( 'previewerAlive' ).set( false );
			};
			scheduleKeepAliveCheck();

			previewer.bind( 'ready', keepAliveTick );
			previewer.bind( 'keep-alive', keepAliveTick );
		},

		/**
		 * Query string data sent with each preview request.
		 *
		 * @abstract
		 */
		query: function() {},

		abort: function() {
			if ( this.loading ) {
				this.loading.destroy();
				delete this.loading;
			}
		},

		/**
		 * Refresh the preview seamlessly.
		 *
		 * @since 3.4.0
		 * @access public
		 *
		 * @return {void}
		 */
		refresh: function() {
			var previewer = this, onSettingChange;

			// Display loading indicator.
			previewer.send( 'loading-initiated' );

			previewer.abort();

			previewer.loading = new api.PreviewFrame({
				url:        previewer.url(),
				previewUrl: previewer.previewUrl(),
				query:      previewer.query( { excludeCustomizedSaved: true } ) || {},
				container:  previewer.container
			});

			previewer.settingsModifiedWhileLoading = {};
			onSettingChange = function( setting ) {
				previewer.settingsModifiedWhileLoading[ setting.id ] = true;
			};
			api.bind( 'change', onSettingChange );
			previewer.loading.always( function() {
				api.unbind( 'change', onSettingChange );
			} );

			previewer.loading.done( function( readyData ) {
				var loadingFrame = this, onceSynced;

				previewer.preview = loadingFrame;
				previewer.targetWindow( loadingFrame.targetWindow() );
				previewer.channel( loadingFrame.channel() );

				onceSynced = function() {
					loadingFrame.unbind( 'synced', onceSynced );
					if ( previewer._previousPreview ) {
						previewer._previousPreview.destroy();
					}
					previewer._previousPreview = previewer.preview;
					previewer.deferred.active.resolve();
					delete previewer.loading;
				};
				loadingFrame.bind( 'synced', onceSynced );

				// This event will be received directly by the previewer in normal navigation; this is only needed for seamless refresh.
				previewer.trigger( 'ready', readyData );
			});

			previewer.loading.fail( function( reason ) {
				previewer.send( 'loading-failed' );

				if ( 'logged out' === reason ) {
					if ( previewer.preview ) {
						previewer.preview.destroy();
						delete previewer.preview;
					}

					previewer.login().done( previewer.refresh );
				}

				if ( 'cheatin' === reason ) {
					previewer.cheatin();
				}
			});
		},

		login: function() {
			var previewer = this,
				deferred, messenger, iframe;

			if ( this._login ) {
				return this._login;
			}

			deferred = $.Deferred();
			this._login = deferred.promise();

			messenger = new api.Messenger({
				channel: 'login',
				url:     api.settings.url.login
			});

			iframe = $( '<iframe />', { 'src': api.settings.url.login, 'title': api.l10n.loginIframeTitle } ).appendTo( this.container );

			messenger.targetWindow( iframe[0].contentWindow );

			messenger.bind( 'login', function () {
				var refreshNonces = previewer.refreshNonces();

				refreshNonces.always( function() {
					iframe.remove();
					messenger.destroy();
					delete previewer._login;
				});

				refreshNonces.done( function() {
					deferred.resolve();
				});

				refreshNonces.fail( function() {
					previewer.cheatin();
					deferred.reject();
				});
			});

			return this._login;
		},

		cheatin: function() {
			$( document.body ).empty().addClass( 'cheatin' ).append(
				'<h1>' + api.l10n.notAllowedHeading + '</h1>' +
				'<p>' + api.l10n.notAllowed + '</p>'
			);
		},

		refreshNonces: function() {
			var request, deferred = $.Deferred();

			deferred.promise();

			request = wp.ajax.post( 'customize_refresh_nonces', {
				wp_customize: 'on',
				customize_theme: api.settings.theme.stylesheet
			});

			request.done( function( response ) {
				api.trigger( 'nonce-refresh', response );
				deferred.resolve();
			});

			request.fail( function() {
				deferred.reject();
			});

			return deferred;
		}
	});

	api.settingConstructor = {};
	api.controlConstructor = {
		color:               api.ColorControl,
		media:               api.MediaControl,
		upload:              api.UploadControl,
		image:               api.ImageControl,
		cropped_image:       api.CroppedImageControl,
		site_icon:           api.SiteIconControl,
		header:              api.HeaderControl,
		background:          api.BackgroundControl,
		background_position: api.BackgroundPositionControl,
		theme:               api.ThemeControl,
		date_time:           api.DateTimeControl,
		code_editor:         api.CodeEditorControl
	};
	api.panelConstructor = {
		themes: api.ThemesPanel
	};
	api.sectionConstructor = {
		themes: api.ThemesSection,
		outer: api.OuterSection
	};

	/**
	 * Handle setting_validities in an error response for the customize-save request.
	 *
	 * Add notifications to the settings and focus on the first control that has an invalid setting.
	 *
	 * @alias wp.customize._handleSettingValidities
	 *
	 * @since 4.6.0
	 * @private
	 *
	 * @param {Object}  args
	 * @param {Object}  args.settingValidities
	 * @param {boolean} [args.focusInvalidControl=false]
	 * @return {void}
	 */
	api._handleSettingValidities = function handleSettingValidities( args ) {
		var invalidSettingControls, invalidSettings = [], wasFocused = false;

		// Find the controls that correspond to each invalid setting.
		_.each( args.settingValidities, function( validity, settingId ) {
			var setting = api( settingId );
			if ( setting ) {

				// Add notifications for invalidities.
				if ( _.isObject( validity ) ) {
					_.each( validity, function( params, code ) {
						var notification, existingNotification, needsReplacement = false;
						notification = new api.Notification( code, _.extend( { fromServer: true }, params ) );

						// Remove existing notification if already exists for code but differs in parameters.
						existingNotification = setting.notifications( notification.code );
						if ( existingNotification ) {
							needsReplacement = notification.type !== existingNotification.type || notification.message !== existingNotification.message || ! _.isEqual( notification.data, existingNotification.data );
						}
						if ( needsReplacement ) {
							setting.notifications.remove( code );
						}

						if ( ! setting.notifications.has( notification.code ) ) {
							setting.notifications.add( notification );
						}
						invalidSettings.push( setting.id );
					} );
				}

				// Remove notification errors that are no longer valid.
				setting.notifications.each( function( notification ) {
					if ( notification.fromServer && 'error' === notification.type && ( true === validity || ! validity[ notification.code ] ) ) {
						setting.notifications.remove( notification.code );
					}
				} );
			}
		} );

		if ( args.focusInvalidControl ) {
			invalidSettingControls = api.findControlsForSettings( invalidSettings );

			// Focus on the first control that is inside of an expanded section (one that is visible).
			_( _.values( invalidSettingControls ) ).find( function( controls ) {
				return _( controls ).find( function( control ) {
					var isExpanded = control.section() && api.section.has( control.section() ) && api.section( control.section() ).expanded();
					if ( isExpanded && control.expanded ) {
						isExpanded = control.expanded();
					}
					if ( isExpanded ) {
						control.focus();
						wasFocused = true;
					}
					return wasFocused;
				} );
			} );

			// Focus on the first invalid control.
			if ( ! wasFocused && ! _.isEmpty( invalidSettingControls ) ) {
				_.values( invalidSettingControls )[0][0].focus();
			}
		}
	};

	/**
	 * Find all controls associated with the given settings.
	 *
	 * @alias wp.customize.findControlsForSettings
	 *
	 * @since 4.6.0
	 * @param {string[]} settingIds Setting IDs.
	 * @return {Object<string, wp.customize.Control>} Mapping setting ids to arrays of controls.
	 */
	api.findControlsForSettings = function findControlsForSettings( settingIds ) {
		var controls = {}, settingControls;
		_.each( _.unique( settingIds ), function( settingId ) {
			var setting = api( settingId );
			if ( setting ) {
				settingControls = setting.findControls();
				if ( settingControls && settingControls.length > 0 ) {
					controls[ settingId ] = settingControls;
				}
			}
		} );
		return controls;
	};

	/**
	 * Sort panels, sections, controls by priorities. Hide empty sections and panels.
	 *
	 * @alias wp.customize.reflowPaneContents
	 *
	 * @since 4.1.0
	 */
	api.reflowPaneContents = _.bind( function () {

		var appendContainer, activeElement, rootHeadContainers, rootNodes = [], wasReflowed = false;

		if ( document.activeElement ) {
			activeElement = $( document.activeElement );
		}

		// Sort the sections within each panel.
		api.panel.each( function ( panel ) {
			if ( 'themes' === panel.id ) {
				return; // Don't reflow theme sections, as doing so moves them after the themes container.
			}

			var sections = panel.sections(),
				sectionHeadContainers = _.pluck( sections, 'headContainer' );
			rootNodes.push( panel );
			appendContainer = ( panel.contentContainer.is( 'ul' ) ) ? panel.contentContainer : panel.contentContainer.find( 'ul:first' );
			if ( ! api.utils.areElementListsEqual( sectionHeadContainers, appendContainer.children( '[id]' ) ) ) {
				_( sections ).each( function ( section ) {
					appendContainer.append( section.headContainer );
				} );
				wasReflowed = true;
			}
		} );

		// Sort the controls within each section.
		api.section.each( function ( section ) {
			var controls = section.controls(),
				controlContainers = _.pluck( controls, 'container' );
			if ( ! section.panel() ) {
				rootNodes.push( section );
			}
			appendContainer = ( section.contentContainer.is( 'ul' ) ) ? section.contentContainer : section.contentContainer.find( 'ul:first' );
			if ( ! api.utils.areElementListsEqual( controlContainers, appendContainer.children( '[id]' ) ) ) {
				_( controls ).each( function ( control ) {
					appendContainer.append( control.container );
				} );
				wasReflowed = true;
			}
		} );

		// Sort the root panels and sections.
		rootNodes.sort( api.utils.prioritySort );
		rootHeadContainers = _.pluck( rootNodes, 'headContainer' );
		appendContainer = $( '#customize-theme-controls .customize-pane-parent' ); // @todo This should be defined elsewhere, and to be configurable.
		if ( ! api.utils.areElementListsEqual( rootHeadContainers, appendContainer.children() ) ) {
			_( rootNodes ).each( function ( rootNode ) {
				appendContainer.append( rootNode.headContainer );
			} );
			wasReflowed = true;
		}

		// Now re-trigger the active Value callbacks so that the panels and sections can decide whether they can be rendered.
		api.panel.each( function ( panel ) {
			var value = panel.active();
			panel.active.callbacks.fireWith( panel.active, [ value, value ] );
		} );
		api.section.each( function ( section ) {
			var value = section.active();
			section.active.callbacks.fireWith( section.active, [ value, value ] );
		} );

		// Restore focus if there was a reflow and there was an active (focused) element.
		if ( wasReflowed && activeElement ) {
			activeElement.trigger( 'focus' );
		}
		api.trigger( 'pane-contents-reflowed' );
	}, api );

	// Define state values.
	api.state = new api.Values();
	_.each( [
		'saved',
		'saving',
		'trashing',
		'activated',
		'processing',
		'paneVisible',
		'expandedPanel',
		'expandedSection',
		'changesetDate',
		'selectedChangesetDate',
		'changesetStatus',
		'selectedChangesetStatus',
		'remainingTimeToPublish',
		'previewerAlive',
		'editShortcutVisibility',
		'changesetLocked',
		'previewedDevice'
	], function( name ) {
		api.state.create( name );
	});

	$( function() {
		api.settings = window._wpCustomizeSettings;
		api.l10n = window._wpCustomizeControlsL10n;

		// Check if we can run the Customizer.
		if ( ! api.settings ) {
			return;
		}

		// Bail if any incompatibilities are found.
		if ( ! $.support.postMessage || ( ! $.support.cors && api.settings.isCrossDomain ) ) {
			return;
		}

		if ( null === api.PreviewFrame.prototype.sensitivity ) {
			api.PreviewFrame.prototype.sensitivity = api.settings.timeouts.previewFrameSensitivity;
		}
		if ( null === api.Previewer.prototype.refreshBuffer ) {
			api.Previewer.prototype.refreshBuffer = api.settings.timeouts.windowRefresh;
		}

		var parent,
			body = $( document.body ),
			overlay = body.children( '.wp-full-overlay' ),
			title = $( '#customize-info .panel-title.site-title' ),
			closeBtn = $( '.customize-controls-close' ),
			saveBtn = $( '#save' ),
			btnWrapper = $( '#customize-save-button-wrapper' ),
			publishSettingsBtn = $( '#publish-settings' ),
			footerActions = $( '#customize-footer-actions' );

		// Add publish settings section in JS instead of PHP since the Customizer depends on it to function.
		api.bind( 'ready', function() {
			api.section.add( new api.OuterSection( 'publish_settings', {
				title: api.l10n.publishSettings,
				priority: 0,
				active: api.settings.theme.active
			} ) );
		} );

		// Set up publish settings section and its controls.
		api.section( 'publish_settings', function( section ) {
			var updateButtonsState, trashControl, updateSectionActive, isSectionActive, statusControl, dateControl, toggleDateControl, publishWhenTime, pollInterval, updateTimeArrivedPoller, cancelScheduleButtonReminder, timeArrivedPollingInterval = 1000;

			trashControl = new api.Control( 'trash_changeset', {
				type: 'button',
				section: section.id,
				priority: 30,
				input_attrs: {
					'class': 'button-link button-link-delete',
					value: api.l10n.discardChanges
				}
			} );
			api.control.add( trashControl );
			trashControl.deferred.embedded.done( function() {
				trashControl.container.find( '.button-link' ).on( 'click', function() {
					if ( confirm( api.l10n.trashConfirm ) ) {
						wp.customize.previewer.trash();
					}
				} );
			} );

			api.control.add( new api.PreviewLinkControl( 'changeset_preview_link', {
				section: section.id,
				priority: 100
			} ) );

			/**
			 * Return whether the pubish settings section should be active.
			 *
			 * @return {boolean} Is section active.
			 */
			isSectionActive = function() {
				if ( ! api.state( 'activated' ).get() ) {
					return false;
				}
				if ( api.state( 'trashing' ).get() || 'trash' === api.state( 'changesetStatus' ).get() ) {
					return false;
				}
				if ( '' === api.state( 'changesetStatus' ).get() && api.state( 'saved' ).get() ) {
					return false;
				}
				return true;
			};

			// Make sure publish settings are not available while the theme is not active and the customizer is in a published state.
			section.active.validate = isSectionActive;
			updateSectionActive = function() {
				section.active.set( isSectionActive() );
			};
			api.state( 'activated' ).bind( updateSectionActive );
			api.state( 'trashing' ).bind( updateSectionActive );
			api.state( 'saved' ).bind( updateSectionActive );
			api.state( 'changesetStatus' ).bind( updateSectionActive );
			updateSectionActive();

			// Bind visibility of the publish settings button to whether the section is active.
			updateButtonsState = function() {
				publishSettingsBtn.toggle( section.active.get() );
				saveBtn.toggleClass( 'has-next-sibling', section.active.get() );
			};
			updateButtonsState();
			section.active.bind( updateButtonsState );

			function highlightScheduleButton() {
				if ( ! cancelScheduleButtonReminder ) {
					cancelScheduleButtonReminder = api.utils.highlightButton( btnWrapper, {
						delay: 1000,

						/*
						 * Only abort the reminder when the save button is focused.
						 * If the user clicks the settings button to toggle the
						 * settings closed, we'll still remind them.
						 */
						focusTarget: saveBtn
					} );
				}
			}
			function cancelHighlightScheduleButton() {
				if ( cancelScheduleButtonReminder ) {
					cancelScheduleButtonReminder();
					cancelScheduleButtonReminder = null;
				}
			}
			api.state( 'selectedChangesetStatus' ).bind( cancelHighlightScheduleButton );

			section.contentContainer.find( '.customize-action' ).text( api.l10n.updating );
			section.contentContainer.find( '.customize-section-back' ).removeAttr( 'tabindex' );
			publishSettingsBtn.prop( 'disabled', false );

			publishSettingsBtn.on( 'click', function( event ) {
				event.preventDefault();
				section.expanded.set( ! section.expanded.get() );
			} );

			section.expanded.bind( function( isExpanded ) {
				var defaultChangesetStatus;
				publishSettingsBtn.attr( 'aria-expanded', String( isExpanded ) );
				publishSettingsBtn.toggleClass( 'active', isExpanded );

				if ( isExpanded ) {
					cancelHighlightScheduleButton();
					return;
				}

				defaultChangesetStatus = api.state( 'changesetStatus' ).get();
				if ( '' === defaultChangesetStatus || 'auto-draft' === defaultChangesetStatus ) {
					defaultChangesetStatus = 'publish';
				}

				if ( api.state( 'selectedChangesetStatus' ).get() !== defaultChangesetStatus ) {
					highlightScheduleButton();
				} else if ( 'future' === api.state( 'selectedChangesetStatus' ).get() && api.state( 'selectedChangesetDate' ).get() !== api.state( 'changesetDate' ).get() ) {
					highlightScheduleButton();
				}
			} );

			statusControl = new api.Control( 'changeset_status', {
				priority: 10,
				type: 'radio',
				section: 'publish_settings',
				setting: api.state( 'selectedChangesetStatus' ),
				templateId: 'customize-selected-changeset-status-control',
				label: api.l10n.action,
				choices: api.settings.changeset.statusChoices
			} );
			api.control.add( statusControl );

			dateControl = new api.DateTimeControl( 'changeset_scheduled_date', {
				priority: 20,
				section: 'publish_settings',
				setting: api.state( 'selectedChangesetDate' ),
				minYear: ( new Date() ).getFullYear(),
				allowPastDate: false,
				includeTime: true,
				twelveHourFormat: /a/i.test( api.settings.timeFormat ),
				description: api.l10n.scheduleDescription
			} );
			dateControl.notifications.alt = true;
			api.control.add( dateControl );

			publishWhenTime = function() {
				api.state( 'selectedChangesetStatus' ).set( 'publish' );
				api.previewer.save();
			};

			// Start countdown for when the dateTime arrives, or clear interval when it is .
			updateTimeArrivedPoller = function() {
				var shouldPoll = (
					'future' === api.state( 'changesetStatus' ).get() &&
					'future' === api.state( 'selectedChangesetStatus' ).get() &&
					api.state( 'changesetDate' ).get() &&
					api.state( 'selectedChangesetDate' ).get() === api.state( 'changesetDate' ).get() &&
					api.utils.getRemainingTime( api.state( 'changesetDate' ).get() ) >= 0
				);

				if ( shouldPoll && ! pollInterval ) {
					pollInterval = setInterval( function() {
						var remainingTime = api.utils.getRemainingTime( api.state( 'changesetDate' ).get() );
						api.state( 'remainingTimeToPublish' ).set( remainingTime );
						if ( remainingTime <= 0 ) {
							clearInterval( pollInterval );
							pollInterval = 0;
							publishWhenTime();
						}
					}, timeArrivedPollingInterval );
				} else if ( ! shouldPoll && pollInterval ) {
					clearInterval( pollInterval );
					pollInterval = 0;
				}
			};

			api.state( 'changesetDate' ).bind( updateTimeArrivedPoller );
			api.state( 'selectedChangesetDate' ).bind( updateTimeArrivedPoller );
			api.state( 'changesetStatus' ).bind( updateTimeArrivedPoller );
			api.state( 'selectedChangesetStatus' ).bind( updateTimeArrivedPoller );
			updateTimeArrivedPoller();

			// Ensure dateControl only appears when selected status is future.
			dateControl.active.validate = function() {
				return 'future' === api.state( 'selectedChangesetStatus' ).get();
			};
			toggleDateControl = function( value ) {
				dateControl.active.set( 'future' === value );
			};
			toggleDateControl( api.state( 'selectedChangesetStatus' ).get() );
			api.state( 'selectedChangesetStatus' ).bind( toggleDateControl );

			// Show notification on date control when status is future but it isn't a future date.
			api.state( 'saving' ).bind( function( isSaving ) {
				if ( isSaving && 'future' === api.state( 'selectedChangesetStatus' ).get() ) {
					dateControl.toggleFutureDateNotification( ! dateControl.isFutureDate() );
				}
			} );
		} );

		// Prevent the form from saving when enter is pressed on an input or select element.
		$('#customize-controls').on( 'keydown', function( e ) {
			var isEnter = ( 13 === e.which ),
				$el = $( e.target );

			if ( isEnter && ( $el.is( 'input:not([type=button])' ) || $el.is( 'select' ) ) ) {
				e.preventDefault();
			}
		});

		// Expand/Collapse the main customizer customize info.
		$( '.customize-info' ).find( '> .accordion-section-title .customize-help-toggle' ).on( 'click', function() {
			var section = $( this ).closest( '.accordion-section' ),
				content = section.find( '.customize-panel-description:first' );

			if ( section.hasClass( 'cannot-expand' ) ) {
				return;
			}

			if ( section.hasClass( 'open' ) ) {
				section.toggleClass( 'open' );
				content.slideUp( api.Panel.prototype.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				$( this ).attr( 'aria-expanded', false );
			} else {
				content.slideDown( api.Panel.prototype.defaultExpandedArguments.duration, function() {
					content.trigger( 'toggled' );
				} );
				section.toggleClass( 'open' );
				$( this ).attr( 'aria-expanded', true );
			}
		});

		/**
		 * Initialize Previewer
		 *
		 * @alias wp.customize.previewer
		 */
		api.previewer = new api.Previewer({
			container:   '#customize-preview',
			form:        '#customize-controls',
			previewUrl:  api.settings.url.preview,
			allowedUrls: api.settings.url.allowed
		},/** @lends wp.customize.previewer */{

			nonce: api.settings.nonce,

			/**
			 * Build the query to send along with the Preview request.
			 *
			 * @since 3.4.0
			 * @since 4.7.0 Added options param.
			 * @access public
			 *
			 * @param {Object}  [options] Options.
			 * @param {boolean} [options.excludeCustomizedSaved=false] Exclude saved settings in customized response (values pending writing to changeset).
			 * @return {Object} Query vars.
			 */
			query: function( options ) {
				var queryVars = {
					wp_customize: 'on',
					customize_theme: api.settings.theme.stylesheet,
					nonce: this.nonce.preview,
					customize_changeset_uuid: api.settings.changeset.uuid
				};
				if ( api.settings.changeset.autosaved || ! api.state( 'saved' ).get() ) {
					queryVars.customize_autosaved = 'on';
				}

				/*
				 * Exclude customized data if requested especially for calls to requestChangesetUpdate.
				 * Changeset updates are differential and so it is a performance waste to send all of
				 * the dirty settings with each update.
				 */
				queryVars.customized = JSON.stringify( api.dirtyValues( {
					unsaved: options && options.excludeCustomizedSaved
				} ) );

				return queryVars;
			},

			/**
			 * Save (and publish) the customizer changeset.
			 *
			 * Updates to the changeset are transactional. If any of the settings
			 * are invalid then none of them will be written into the changeset.
			 * A revision will be made for the changeset post if revisions support
			 * has been added to the post type.
			 *
			 * @since 3.4.0
			 * @since 4.7.0 Added args param and return value.
			 *
			 * @param {Object} [args] Args.
			 * @param {string} [args.status=publish] Status.
			 * @param {string} [args.date] Date, in local time in MySQL format.
			 * @param {string} [args.title] Title
			 * @return {jQuery.promise} Promise.
			 */
			save: function( args ) {
				var previewer = this,
					deferred = $.Deferred(),
					changesetStatus = api.state( 'selectedChangesetStatus' ).get(),
					selectedChangesetDate = api.state( 'selectedChangesetDate' ).get(),
					processing = api.state( 'processing' ),
					submitWhenDoneProcessing,
					submit,
					modifiedWhileSaving = {},
					invalidSettings = [],
					invalidControls = [],
					invalidSettingLessControls = [];

				if ( args && args.status ) {
					changesetStatus = args.status;
				}

				if ( api.state( 'saving' ).get() ) {
					deferred.reject( 'already_saving' );
					deferred.promise();
				}

				api.state( 'saving' ).set( true );

				function captureSettingModifiedDuringSave( setting ) {
					modifiedWhileSaving[ setting.id ] = true;
				}

				submit = function () {
					var request, query, settingInvalidities = {}, latestRevision = api._latestRevision, errorCode = 'client_side_error';

					api.bind( 'change', captureSettingModifiedDuringSave );
					api.notifications.remove( errorCode );

					/*
					 * Block saving if there are any settings that are marked as
					 * invalid from the client (not from the server). Focus on
					 * the control.
					 */
					api.each( function( setting ) {
						setting.notifications.each( function( notification ) {
							if ( 'error' === notification.type && ! notification.fromServer ) {
								invalidSettings.push( setting.id );
								if ( ! settingInvalidities[ setting.id ] ) {
									settingInvalidities[ setting.id ] = {};
								}
								settingInvalidities[ setting.id ][ notification.code ] = notification;
							}
						} );
					} );

					// Find all invalid setting less controls with notification type error.
					api.control.each( function( control ) {
						if ( ! control.setting || ! control.setting.id && control.active.get() ) {
							control.notifications.each( function( notification ) {
							    if ( 'error' === notification.type ) {
								    invalidSettingLessControls.push( [ control ] );
							    }
							} );
						}
					} );

					invalidControls = _.union( invalidSettingLessControls, _.values( api.findControlsForSettings( invalidSettings ) ) );
					if ( ! _.isEmpty( invalidControls ) ) {

						invalidControls[0][0].focus();
						api.unbind( 'change', captureSettingModifiedDuringSave );

						if ( invalidSettings.length ) {
							api.notifications.add( new api.Notification( errorCode, {
								message: ( 1 === invalidSettings.length ? api.l10n.saveBlockedError.singular : api.l10n.saveBlockedError.plural ).replace( /%s/g, String( invalidSettings.length ) ),
								type: 'error',
								dismissible: true,
								saveFailure: true
							} ) );
						}

						deferred.rejectWith( previewer, [
							{ setting_invalidities: settingInvalidities }
						] );
						api.state( 'saving' ).set( false );
						return deferred.promise();
					}

					/*
					 * Note that excludeCustomizedSaved is intentionally false so that the entire
					 * set of customized data will be included if bypassed changeset update.
					 */
					query = $.extend( previewer.query( { excludeCustomizedSaved: false } ), {
						nonce: previewer.nonce.save,
						customize_changeset_status: changesetStatus
					} );

					if ( args && args.date ) {
						query.customize_changeset_date = args.date;
					} else if ( 'future' === changesetStatus && selectedChangesetDate ) {
						query.customize_changeset_date = selectedChangesetDate;
					}

					if ( args && args.title ) {
						query.customize_changeset_title = args.title;
					}

					// Allow plugins to modify the params included with the save request.
					api.trigger( 'save-request-params', query );

					/*
					 * Note that the dirty customized values will have already been set in the
					 * changeset and so technically query.customized could be deleted. However,
					 * it is remaining here to make sure that any settings that got updated
					 * quietly which may have not triggered an update request will also get
					 * included in the values that get saved to the changeset. This will ensure
					 * that values that get injected via the saved event will be included in
					 * the changeset. This also ensures that setting values that were invalid
					 * will get re-validated, perhaps in the case of settings that are invalid
					 * due to dependencies on other settings.
					 */
					request = wp.ajax.post( 'customize_save', query );
					api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );

					api.trigger( 'save', request );

					request.always( function () {
						api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
						api.state( 'saving' ).set( false );
						api.unbind( 'change', captureSettingModifiedDuringSave );
					} );

					// Remove notifications that were added due to save failures.
					api.notifications.each( function( notification ) {
						if ( notification.saveFailure ) {
							api.notifications.remove( notification.code );
						}
					});

					request.fail( function ( response ) {
						var notification, notificationArgs;
						notificationArgs = {
							type: 'error',
							dismissible: true,
							fromServer: true,
							saveFailure: true
						};

						if ( '0' === response ) {
							response = 'not_logged_in';
						} else if ( '-1' === response ) {
							// Back-compat in case any other check_ajax_referer() call is dying.
							response = 'invalid_nonce';
						}

						if ( 'invalid_nonce' === response ) {
							previewer.cheatin();
						} else if ( 'not_logged_in' === response ) {
							previewer.preview.iframe.hide();
							previewer.login().done( function() {
								previewer.save();
								previewer.preview.iframe.show();
							} );
						} else if ( response.code ) {
							if ( 'not_future_date' === response.code && api.section.has( 'publish_settings' ) && api.section( 'publish_settings' ).active.get() && api.control.has( 'changeset_scheduled_date' ) ) {
								api.control( 'changeset_scheduled_date' ).toggleFutureDateNotification( true ).focus();
							} else if ( 'changeset_locked' !== response.code ) {
								notification = new api.Notification( response.code, _.extend( notificationArgs, {
									message: response.message
								} ) );
							}
						} else {
							notification = new api.Notification( 'unknown_error', _.extend( notificationArgs, {
								message: api.l10n.unknownRequestFail
							} ) );
						}

						if ( notification ) {
							api.notifications.add( notification );
						}

						if ( response.setting_validities ) {
							api._handleSettingValidities( {
								settingValidities: response.setting_validities,
								focusInvalidControl: true
							} );
						}

						deferred.rejectWith( previewer, [ response ] );
						api.trigger( 'error', response );

						// Start a new changeset if the underlying changeset was published.
						if ( 'changeset_already_published' === response.code && response.next_changeset_uuid ) {
							api.settings.changeset.uuid = response.next_changeset_uuid;
							api.state( 'changesetStatus' ).set( '' );
							if ( api.settings.changeset.branching ) {
								parent.send( 'changeset-uuid', api.settings.changeset.uuid );
							}
							api.previewer.send( 'changeset-uuid', api.settings.changeset.uuid );
						}
					} );

					request.done( function( response ) {

						previewer.send( 'saved', response );

						api.state( 'changesetStatus' ).set( response.changeset_status );
						if ( response.changeset_date ) {
							api.state( 'changesetDate' ).set( response.changeset_date );
						}

						if ( 'publish' === response.changeset_status ) {

							// Mark all published as clean if they haven't been modified during the request.
							api.each( function( setting ) {
								/*
								 * Note that the setting revision will be undefined in the case of setting
								 * values that are marked as dirty when the customizer is loaded, such as
								 * when applying starter content. All other dirty settings will have an
								 * associated revision due to their modification triggering a change event.
								 */
								if ( setting._dirty && ( _.isUndefined( api._latestSettingRevisions[ setting.id ] ) || api._latestSettingRevisions[ setting.id ] <= latestRevision ) ) {
									setting._dirty = false;
								}
							} );

							api.state( 'changesetStatus' ).set( '' );
							api.settings.changeset.uuid = response.next_changeset_uuid;
							if ( api.settings.changeset.branching ) {
								parent.send( 'changeset-uuid', api.settings.changeset.uuid );
							}
						}

						// Prevent subsequent requestChangesetUpdate() calls from including the settings that have been saved.
						api._lastSavedRevision = Math.max( latestRevision, api._lastSavedRevision );

						if ( response.setting_validities ) {
							api._handleSettingValidities( {
								settingValidities: response.setting_validities,
								focusInvalidControl: true
							} );
						}

						deferred.resolveWith( previewer, [ response ] );
						api.trigger( 'saved', response );

						// Restore the global dirty state if any settings were modified during save.
						if ( ! _.isEmpty( modifiedWhileSaving ) ) {
							api.state( 'saved' ).set( false );
						}
					} );
				};

				if ( 0 === processing() ) {
					submit();
				} else {
					submitWhenDoneProcessing = function () {
						if ( 0 === processing() ) {
							api.state.unbind( 'change', submitWhenDoneProcessing );
							submit();
						}
					};
					api.state.bind( 'change', submitWhenDoneProcessing );
				}

				return deferred.promise();
			},

			/**
			 * Trash the current changes.
			 *
			 * Revert the Customizer to its previously-published state.
			 *
			 * @since 4.9.0
			 *
			 * @return {jQuery.promise} Promise.
			 */
			trash: function trash() {
				var request, success, fail;

				api.state( 'trashing' ).set( true );
				api.state( 'processing' ).set( api.state( 'processing' ).get() + 1 );

				request = wp.ajax.post( 'customize_trash', {
					customize_changeset_uuid: api.settings.changeset.uuid,
					nonce: api.settings.nonce.trash
				} );
				api.notifications.add( new api.OverlayNotification( 'changeset_trashing', {
					type: 'info',
					message: api.l10n.revertingChanges,
					loading: true
				} ) );

				success = function() {
					var urlParser = document.createElement( 'a' ), queryParams;

					api.state( 'changesetStatus' ).set( 'trash' );
					api.each( function( setting ) {
						setting._dirty = false;
					} );
					api.state( 'saved' ).set( true );

					// Go back to Customizer without changeset.
					urlParser.href = location.href;
					queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
					delete queryParams.changeset_uuid;
					queryParams['return'] = api.settings.url['return'];
					urlParser.search = $.param( queryParams );
					location.replace( urlParser.href );
				};

				fail = function( code, message ) {
					var notificationCode = code || 'unknown_error';
					api.state( 'processing' ).set( api.state( 'processing' ).get() - 1 );
					api.state( 'trashing' ).set( false );
					api.notifications.remove( 'changeset_trashing' );
					api.notifications.add( new api.Notification( notificationCode, {
						message: message || api.l10n.unknownError,
						dismissible: true,
						type: 'error'
					} ) );
				};

				request.done( function( response ) {
					success( response.message );
				} );

				request.fail( function( response ) {
					var code = response.code || 'trashing_failed';
					if ( response.success || 'non_existent_changeset' === code || 'changeset_already_trashed' === code ) {
						success( response.message );
					} else {
						fail( code, response.message );
					}
				} );
			},

			/**
			 * Builds the front preview URL with the current state of customizer.
			 *
			 * @since 4.9.0
			 *
			 * @return {string} Preview URL.
			 */
			getFrontendPreviewUrl: function() {
				var previewer = this, params, urlParser;
				urlParser = document.createElement( 'a' );
				urlParser.href = previewer.previewUrl.get();
				params = api.utils.parseQueryString( urlParser.search.substr( 1 ) );

				if ( api.state( 'changesetStatus' ).get() && 'publish' !== api.state( 'changesetStatus' ).get() ) {
					params.customize_changeset_uuid = api.settings.changeset.uuid;
				}
				if ( ! api.state( 'activated' ).get() ) {
					params.customize_theme = api.settings.theme.stylesheet;
				}

				urlParser.search = $.param( params );
				return urlParser.href;
			}
		});

		// Ensure preview nonce is included with every customized request, to allow post data to be read.
		$.ajaxPrefilter( function injectPreviewNonce( options ) {
			if ( ! /wp_customize=on/.test( options.data ) ) {
				return;
			}
			options.data += '&' + $.param({
				customize_preview_nonce: api.settings.nonce.preview
			});
		});

		// Refresh the nonces if the preview sends updated nonces over.
		api.previewer.bind( 'nonce', function( nonce ) {
			$.extend( this.nonce, nonce );
		});

		// Refresh the nonces if login sends updated nonces over.
		api.bind( 'nonce-refresh', function( nonce ) {
			$.extend( api.settings.nonce, nonce );
			$.extend( api.previewer.nonce, nonce );
			api.previewer.send( 'nonce-refresh', nonce );
		});

		// Create Settings.
		$.each( api.settings.settings, function( id, data ) {
			var Constructor = api.settingConstructor[ data.type ] || api.Setting;
			api.add( new Constructor( id, data.value, {
				transport: data.transport,
				previewer: api.previewer,
				dirty: !! data.dirty
			} ) );
		});

		// Create Panels.
		$.each( api.settings.panels, function ( id, data ) {
			var Constructor = api.panelConstructor[ data.type ] || api.Panel, options;
			// Inclusion of params alias is for back-compat for custom panels that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.panel.add( new Constructor( id, options ) );
		});

		// Create Sections.
		$.each( api.settings.sections, function ( id, data ) {
			var Constructor = api.sectionConstructor[ data.type ] || api.Section, options;
			// Inclusion of params alias is for back-compat for custom sections that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.section.add( new Constructor( id, options ) );
		});

		// Create Controls.
		$.each( api.settings.controls, function( id, data ) {
			var Constructor = api.controlConstructor[ data.type ] || api.Control, options;
			// Inclusion of params alias is for back-compat for custom controls that expect to augment this property.
			options = _.extend( { params: data }, data );
			api.control.add( new Constructor( id, options ) );
		});

		// Focus the autofocused element.
		_.each( [ 'panel', 'section', 'control' ], function( type ) {
			var id = api.settings.autofocus[ type ];
			if ( ! id ) {
				return;
			}

			/*
			 * Defer focus until:
			 * 1. The panel, section, or control exists (especially for dynamically-created ones).
			 * 2. The instance is embedded in the document (and so is focusable).
			 * 3. The preview has finished loading so that the active states have been set.
			 */
			api[ type ]( id, function( instance ) {
				instance.deferred.embedded.done( function() {
					api.previewer.deferred.active.done( function() {
						instance.focus();
					});
				});
			});
		});

		api.bind( 'ready', api.reflowPaneContents );
		$( [ api.panel, api.section, api.control ] ).each( function ( i, values ) {
			var debouncedReflowPaneContents = _.debounce( api.reflowPaneContents, api.settings.timeouts.reflowPaneContents );
			values.bind( 'add', debouncedReflowPaneContents );
			values.bind( 'change', debouncedReflowPaneContents );
			values.bind( 'remove', debouncedReflowPaneContents );
		} );

		// Set up global notifications area.
		api.bind( 'ready', function setUpGlobalNotificationsArea() {
			var sidebar, containerHeight, containerInitialTop;
			api.notifications.container = $( '#customize-notifications-area' );

			api.notifications.bind( 'change', _.debounce( function() {
				api.notifications.render();
			} ) );

			sidebar = $( '.wp-full-overlay-sidebar-content' );
			api.notifications.bind( 'rendered', function updateSidebarTop() {
				sidebar.css( 'top', '' );
				if ( 0 !== api.notifications.count() ) {
					containerHeight = api.notifications.container.outerHeight() + 1;
					containerInitialTop = parseInt( sidebar.css( 'top' ), 10 );
					sidebar.css( 'top', containerInitialTop + containerHeight + 'px' );
				}
				api.notifications.trigger( 'sidebarTopUpdated' );
			});

			api.notifications.render();
		});

		// Save and activated states.
		(function( state ) {
			var saved = state.instance( 'saved' ),
				saving = state.instance( 'saving' ),
				trashing = state.instance( 'trashing' ),
				activated = state.instance( 'activated' ),
				processing = state.instance( 'processing' ),
				paneVisible = state.instance( 'paneVisible' ),
				expandedPanel = state.instance( 'expandedPanel' ),
				expandedSection = state.instance( 'expandedSection' ),
				changesetStatus = state.instance( 'changesetStatus' ),
				selectedChangesetStatus = state.instance( 'selectedChangesetStatus' ),
				changesetDate = state.instance( 'changesetDate' ),
				selectedChangesetDate = state.instance( 'selectedChangesetDate' ),
				previewerAlive = state.instance( 'previewerAlive' ),
				editShortcutVisibility  = state.instance( 'editShortcutVisibility' ),
				changesetLocked = state.instance( 'changesetLocked' ),
				populateChangesetUuidParam, defaultSelectedChangesetStatus;

			state.bind( 'change', function() {
				var canSave;

				if ( ! activated() ) {
					saveBtn.val( api.l10n.activate );
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.cancel );

				} else if ( '' === changesetStatus.get() && saved() ) {
					if ( api.settings.changeset.currentUserCanPublish ) {
						saveBtn.val( api.l10n.published );
					} else {
						saveBtn.val( api.l10n.saved );
					}
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.close );

				} else {
					if ( 'draft' === selectedChangesetStatus() ) {
						if ( saved() && selectedChangesetStatus() === changesetStatus() ) {
							saveBtn.val( api.l10n.draftSaved );
						} else {
							saveBtn.val( api.l10n.saveDraft );
						}
					} else if ( 'future' === selectedChangesetStatus() ) {
						if ( saved() && selectedChangesetStatus() === changesetStatus() ) {
							if ( changesetDate.get() !== selectedChangesetDate.get() ) {
								saveBtn.val( api.l10n.schedule );
							} else {
								saveBtn.val( api.l10n.scheduled );
							}
						} else {
							saveBtn.val( api.l10n.schedule );
						}
					} else if ( api.settings.changeset.currentUserCanPublish ) {
						saveBtn.val( api.l10n.publish );
					}
					closeBtn.find( '.screen-reader-text' ).text( api.l10n.cancel );
				}

				/*
				 * Save (publish) button should be enabled if saving is not currently happening,
				 * and if the theme is not active or the changeset exists but is not published.
				 */
				canSave = ! saving() && ! trashing() && ! changesetLocked() && ( ! activated() || ! saved() || ( changesetStatus() !== selectedChangesetStatus() && '' !== changesetStatus() ) || ( 'future' === selectedChangesetStatus() && changesetDate.get() !== selectedChangesetDate.get() ) );

				saveBtn.prop( 'disabled', ! canSave );
			});

			selectedChangesetStatus.validate = function( status ) {
				if ( '' === status || 'auto-draft' === status ) {
					return null;
				}
				return status;
			};

			defaultSelectedChangesetStatus = api.settings.changeset.currentUserCanPublish ? 'publish' : 'draft';

			// Set default states.
			changesetStatus( api.settings.changeset.status );
			changesetLocked( Boolean( api.settings.changeset.lockUser ) );
			changesetDate( api.settings.changeset.publishDate );
			selectedChangesetDate( api.settings.changeset.publishDate );
			selectedChangesetStatus( '' === api.settings.changeset.status || 'auto-draft' === api.settings.changeset.status ? defaultSelectedChangesetStatus : api.settings.changeset.status );
			selectedChangesetStatus.link( changesetStatus ); // Ensure that direct updates to status on server via wp.customizer.previewer.save() will update selection.
			saved( true );
			if ( '' === changesetStatus() ) { // Handle case for loading starter content.
				api.each( function( setting ) {
					if ( setting._dirty ) {
						saved( false );
					}
				} );
			}
			saving( false );
			activated( api.settings.theme.active );
			processing( 0 );
			paneVisible( true );
			expandedPanel( false );
			expandedSection( false );
			previewerAlive( true );
			editShortcutVisibility( 'visible' );

			api.bind( 'change', function() {
				if ( state( 'saved' ).get() ) {
					state( 'saved' ).set( false );
				}
			});

			// Populate changeset UUID param when state becomes dirty.
			if ( api.settings.changeset.branching ) {
				saved.bind( function( isSaved ) {
					if ( ! isSaved ) {
						populateChangesetUuidParam( true );
					}
				});
			}

			saving.bind( function( isSaving ) {
				body.toggleClass( 'saving', isSaving );
			} );
			trashing.bind( function( isTrashing ) {
				body.toggleClass( 'trashing', isTrashing );
			} );

			api.bind( 'saved', function( response ) {
				state('saved').set( true );
				if ( 'publish' === response.changeset_status ) {
					state( 'activated' ).set( true );
				}
			});

			activated.bind( function( to ) {
				if ( to ) {
					api.trigger( 'activated' );
				}
			});

			/**
			 * Populate URL with UUID via `history.replaceState()`.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {boolean} isIncluded Is UUID included.
			 * @return {void}
			 */
			populateChangesetUuidParam = function( isIncluded ) {
				var urlParser, queryParams;

				// Abort on IE9 which doesn't support history management.
				if ( ! history.replaceState ) {
					return;
				}

				urlParser = document.createElement( 'a' );
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				if ( isIncluded ) {
					if ( queryParams.changeset_uuid === api.settings.changeset.uuid ) {
						return;
					}
					queryParams.changeset_uuid = api.settings.changeset.uuid;
				} else {
					if ( ! queryParams.changeset_uuid ) {
						return;
					}
					delete queryParams.changeset_uuid;
				}
				urlParser.search = $.param( queryParams );
				history.replaceState( {}, document.title, urlParser.href );
			};

			// Show changeset UUID in URL when in branching mode and there is a saved changeset.
			if ( api.settings.changeset.branching ) {
				changesetStatus.bind( function( newStatus ) {
					populateChangesetUuidParam( '' !== newStatus && 'publish' !== newStatus && 'trash' !== newStatus );
				} );
			}
		}( api.state ) );

		/**
		 * Handles lock notice and take over request.
		 *
		 * @since 4.9.0
		 */
		( function checkAndDisplayLockNotice() {

			var LockedNotification = api.OverlayNotification.extend(/** @lends wp.customize~LockedNotification.prototype */{

				/**
				 * Template ID.
				 *
				 * @type {string}
				 */
				templateId: 'customize-changeset-locked-notification',

				/**
				 * Lock user.
				 *
				 * @type {object}
				 */
				lockUser: null,

				/**
				 * A notification that is displayed in a full-screen overlay with information about the locked changeset.
				 *
				 * @constructs wp.customize~LockedNotification
				 * @augments   wp.customize.OverlayNotification
				 *
				 * @since 4.9.0
				 *
				 * @param {string} [code] - Code.
				 * @param {Object} [params] - Params.
				 */
				initialize: function( code, params ) {
					var notification = this, _code, _params;
					_code = code || 'changeset_locked';
					_params = _.extend(
						{
							message: '',
							type: 'warning',
							containerClasses: '',
							lockUser: {}
						},
						params
					);
					_params.containerClasses += ' notification-changeset-locked';
					api.OverlayNotification.prototype.initialize.call( notification, _code, _params );
				},

				/**
				 * Render notification.
				 *
				 * @since 4.9.0
				 *
				 * @return {jQuery} Notification container.
				 */
				render: function() {
					var notification = this, li, data, takeOverButton, request;
					data = _.extend(
						{
							allowOverride: false,
							returnUrl: api.settings.url['return'],
							previewUrl: api.previewer.previewUrl.get(),
							frontendPreviewUrl: api.previewer.getFrontendPreviewUrl()
						},
						this
					);

					li = api.OverlayNotification.prototype.render.call( data );

					// Try to autosave the changeset now.
					api.requestChangesetUpdate( {}, { autosave: true } ).fail( function( response ) {
						if ( ! response.autosaved ) {
							li.find( '.notice-error' ).prop( 'hidden', false ).text( response.message || api.l10n.unknownRequestFail );
						}
					} );

					takeOverButton = li.find( '.customize-notice-take-over-button' );
					takeOverButton.on( 'click', function( event ) {
						event.preventDefault();
						if ( request ) {
							return;
						}

						takeOverButton.addClass( 'disabled' );
						request = wp.ajax.post( 'customize_override_changeset_lock', {
							wp_customize: 'on',
							customize_theme: api.settings.theme.stylesheet,
							customize_changeset_uuid: api.settings.changeset.uuid,
							nonce: api.settings.nonce.override_lock
						} );

						request.done( function() {
							api.notifications.remove( notification.code ); // Remove self.
							api.state( 'changesetLocked' ).set( false );
						} );

						request.fail( function( response ) {
							var message = response.message || api.l10n.unknownRequestFail;
							li.find( '.notice-error' ).prop( 'hidden', false ).text( message );

							request.always( function() {
								takeOverButton.removeClass( 'disabled' );
							} );
						} );

						request.always( function() {
							request = null;
						} );
					} );

					return li;
				}
			});

			/**
			 * Start lock.
			 *
			 * @since 4.9.0
			 *
			 * @param {Object} [args] - Args.
			 * @param {Object} [args.lockUser] - Lock user data.
			 * @param {boolean} [args.allowOverride=false] - Whether override is allowed.
			 * @return {void}
			 */
			function startLock( args ) {
				if ( args && args.lockUser ) {
					api.settings.changeset.lockUser = args.lockUser;
				}
				api.state( 'changesetLocked' ).set( true );
				api.notifications.add( new LockedNotification( 'changeset_locked', {
					lockUser: api.settings.changeset.lockUser,
					allowOverride: Boolean( args && args.allowOverride )
				} ) );
			}

			// Show initial notification.
			if ( api.settings.changeset.lockUser ) {
				startLock( { allowOverride: true } );
			}

			// Check for lock when sending heartbeat requests.
			$( document ).on( 'heartbeat-send.update_lock_notice', function( event, data ) {
				data.check_changeset_lock = true;
				data.changeset_uuid = api.settings.changeset.uuid;
			} );

			// Handle heartbeat ticks.
			$( document ).on( 'heartbeat-tick.update_lock_notice', function( event, data ) {
				var notification, code = 'changeset_locked';
				if ( ! data.customize_changeset_lock_user ) {
					return;
				}

				// Update notification when a different user takes over.
				notification = api.notifications( code );
				if ( notification && notification.lockUser.id !== api.settings.changeset.lockUser.id ) {
					api.notifications.remove( code );
				}

				startLock( {
					lockUser: data.customize_changeset_lock_user
				} );
			} );

			// Handle locking in response to changeset save errors.
			api.bind( 'error', function( response ) {
				if ( 'changeset_locked' === response.code && response.lock_user ) {
					startLock( {
						lockUser: response.lock_user
					} );
				}
			} );
		} )();

		// Set up initial notifications.
		(function() {
			var removedQueryParams = [], autosaveDismissed = false;

			/**
			 * Obtain the URL to restore the autosave.
			 *
			 * @return {string} Customizer URL.
			 */
			function getAutosaveRestorationUrl() {
				var urlParser, queryParams;
				urlParser = document.createElement( 'a' );
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				if ( api.settings.changeset.latestAutoDraftUuid ) {
					queryParams.changeset_uuid = api.settings.changeset.latestAutoDraftUuid;
				} else {
					queryParams.customize_autosaved = 'on';
				}
				queryParams['return'] = api.settings.url['return'];
				urlParser.search = $.param( queryParams );
				return urlParser.href;
			}

			/**
			 * Remove parameter from the URL.
			 *
			 * @param {Array} params - Parameter names to remove.
			 * @return {void}
			 */
			function stripParamsFromLocation( params ) {
				var urlParser = document.createElement( 'a' ), queryParams, strippedParams = 0;
				urlParser.href = location.href;
				queryParams = api.utils.parseQueryString( urlParser.search.substr( 1 ) );
				_.each( params, function( param ) {
					if ( 'undefined' !== typeof queryParams[ param ] ) {
						strippedParams += 1;
						delete queryParams[ param ];
					}
				} );
				if ( 0 === strippedParams ) {
					return;
				}

				urlParser.search = $.param( queryParams );
				history.replaceState( {}, document.title, urlParser.href );
			}

			/**
			 * Displays a Site Editor notification when a block theme is activated.
			 *
			 * @since 4.9.0
			 *
			 * @param {string} [notification] - A notification to display.
			 * @return {void}
			 */
			function addSiteEditorNotification( notification ) {
				api.notifications.add( new api.Notification( 'site_editor_block_theme_notice', {
					message: notification,
					type: 'info',
					dismissible: false,
					render: function() {
						var notification = api.Notification.prototype.render.call( this ),
							button = notification.find( 'button.switch-to-editor' );

						button.on( 'click', function( event ) {
							event.preventDefault();
							location.assign( button.data( 'action' ) );
						} );

						return notification;
					}
				} ) );
			}

			/**
			 * Dismiss autosave.
			 *
			 * @return {void}
			 */
			function dismissAutosave() {
				if ( autosaveDismissed ) {
					return;
				}
				wp.ajax.post( 'customize_dismiss_autosave_or_lock', {
					wp_customize: 'on',
					customize_theme: api.settings.theme.stylesheet,
					customize_changeset_uuid: api.settings.changeset.uuid,
					nonce: api.settings.nonce.dismiss_autosave_or_lock,
					dismiss_autosave: true
				} );
				autosaveDismissed = true;
			}

			/**
			 * Add notification regarding the availability of an autosave to restore.
			 *
			 * @return {void}
			 */
			function addAutosaveRestoreNotification() {
				var code = 'autosave_available', onStateChange;

				// Since there is an autosave revision and the user hasn't loaded with autosaved, add notification to prompt to load autosaved version.
				api.notifications.add( new api.Notification( code, {
					message: api.l10n.autosaveNotice,
					type: 'warning',
					dismissible: true,
					render: function() {
						var li = api.Notification.prototype.render.call( this ), link;

						// Handle clicking on restoration link.
						link = li.find( 'a' );
						link.prop( 'href', getAutosaveRestorationUrl() );
						link.on( 'click', function( event ) {
							event.preventDefault();
							location.replace( getAutosaveRestorationUrl() );
						} );

						// Handle dismissal of notice.
						li.find( '.notice-dismiss' ).on( 'click', dismissAutosave );

						return li;
					}
				} ) );

				// Remove the notification once the user starts making changes.
				onStateChange = function() {
					dismissAutosave();
					api.notifications.remove( code );
					api.unbind( 'change', onStateChange );
					api.state( 'changesetStatus' ).unbind( onStateChange );
				};
				api.bind( 'change', onStateChange );
				api.state( 'changesetStatus' ).bind( onStateChange );
			}

			if ( api.settings.changeset.autosaved ) {
				api.state( 'saved' ).set( false );
				removedQueryParams.push( 'customize_autosaved' );
			}
			if ( ! api.settings.changeset.branching && ( ! api.settings.changeset.status || 'auto-draft' === api.settings.changeset.status ) ) {
				removedQueryParams.push( 'changeset_uuid' ); // Remove UUID when restoring autosave auto-draft.
			}
			if ( removedQueryParams.length > 0 ) {
				stripParamsFromLocation( removedQueryParams );
			}
			if ( api.settings.changeset.latestAutoDraftUuid || api.settings.changeset.hasAutosaveRevision ) {
				addAutosaveRestoreNotification();
			}
			var shouldDisplayBlockThemeNotification = !! parseInt( $( '#customize-info' ).data( 'block-theme' ), 10 );
			if (shouldDisplayBlockThemeNotification) {
				addSiteEditorNotification( api.l10n.blockThemeNotification );
			}
		})();

		// Check if preview url is valid and load the preview frame.
		if ( api.previewer.previewUrl() ) {
			api.previewer.refresh();
		} else {
			api.previewer.previewUrl( api.settings.url.home );
		}

		// Button bindings.
		saveBtn.on( 'click', function( event ) {
			api.previewer.save();
			event.preventDefault();
		}).on( 'keydown', function( event ) {
			if ( 9 === event.which ) { // Tab.
				return;
			}
			if ( 13 === event.which ) { // Enter.
				api.previewer.save();
			}
			event.preventDefault();
		});

		closeBtn.on( 'keydown', function( event ) {
			if ( 9 === event.which ) { // Tab.
				return;
			}
			if ( 13 === event.which ) { // Enter.
				this.click();
			}
			event.preventDefault();
		});

		$( '.collapse-sidebar' ).on( 'click', function() {
			api.state( 'paneVisible' ).set( ! api.state( 'paneVisible' ).get() );
		});

		api.state( 'paneVisible' ).bind( function( paneVisible ) {
			overlay.toggleClass( 'preview-only', ! paneVisible );
			overlay.toggleClass( 'expanded', paneVisible );
			overlay.toggleClass( 'collapsed', ! paneVisible );

			if ( ! paneVisible ) {
				$( '.collapse-sidebar' ).attr({ 'aria-expanded': 'false', 'aria-label': api.l10n.expandSidebar });
			} else {
				$( '.collapse-sidebar' ).attr({ 'aria-expanded': 'true', 'aria-label': api.l10n.collapseSidebar });
			}
		});

		// Keyboard shortcuts - esc to exit section/panel.
		body.on( 'keydown', function( event ) {
			var collapsedObject, expandedControls = [], expandedSections = [], expandedPanels = [];

			if ( 27 !== event.which ) { // Esc.
				return;
			}

			/*
			 * Abort if the event target is not the body (the default) and not inside of #customize-controls.
			 * This ensures that ESC meant to collapse a modal dialog or a TinyMCE toolbar won't collapse something else.
			 */
			if ( ! $( event.target ).is( 'body' ) && ! $.contains( $( '#customize-controls' )[0], event.target ) ) {
				return;
			}

			// Abort if we're inside of a block editor instance.
			if ( event.target.closest( '.block-editor-writing-flow' ) !== null ||
				event.target.closest( '.block-editor-block-list__block-popover' ) !== null
			) {
				return;
			}

			// Check for expanded expandable controls (e.g. widgets and nav menus items), sections, and panels.
			api.control.each( function( control ) {
				if ( control.expanded && control.expanded() && _.isFunction( control.collapse ) ) {
					expandedControls.push( control );
				}
			});
			api.section.each( function( section ) {
				if ( section.expanded() ) {
					expandedSections.push( section );
				}
			});
			api.panel.each( function( panel ) {
				if ( panel.expanded() ) {
					expandedPanels.push( panel );
				}
			});

			// Skip collapsing expanded controls if there are no expanded sections.
			if ( expandedControls.length > 0 && 0 === expandedSections.length ) {
				expandedControls.length = 0;
			}

			// Collapse the most granular expanded object.
			collapsedObject = expandedControls[0] || expandedSections[0] || expandedPanels[0];
			if ( collapsedObject ) {
				if ( 'themes' === collapsedObject.params.type ) {

					// Themes panel or section.
					if ( body.hasClass( 'modal-open' ) ) {
						collapsedObject.closeDetails();
					} else if ( api.panel.has( 'themes' ) ) {

						// If we're collapsing a section, collapse the panel also.
						api.panel( 'themes' ).collapse();
					}
					return;
				}
				collapsedObject.collapse();
				event.preventDefault();
			}
		});

		$( '.customize-controls-preview-toggle' ).on( 'click', function() {
			api.state( 'paneVisible' ).set( ! api.state( 'paneVisible' ).get() );
		});

		/*
		 * Sticky header feature.
		 */
		(function initStickyHeaders() {
			var parentContainer = $( '.wp-full-overlay-sidebar-content' ),
				changeContainer, updateHeaderHeight, releaseStickyHeader, resetStickyHeader, positionStickyHeader,
				activeHeader, lastScrollTop;

			/**
			 * Determine which panel or section is currently expanded.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {wp.customize.Panel|wp.customize.Section} container Construct.
			 * @return {void}
			 */
			changeContainer = function( container ) {
				var newInstance = container,
					expandedSection = api.state( 'expandedSection' ).get(),
					expandedPanel = api.state( 'expandedPanel' ).get(),
					headerElement;

				if ( activeHeader && activeHeader.element ) {
					// Release previously active header element.
					releaseStickyHeader( activeHeader.element );

					// Remove event listener in the previous panel or section.
					activeHeader.element.find( '.description' ).off( 'toggled', updateHeaderHeight );
				}

				if ( ! newInstance ) {
					if ( ! expandedSection && expandedPanel && expandedPanel.contentContainer ) {
						newInstance = expandedPanel;
					} else if ( ! expandedPanel && expandedSection && expandedSection.contentContainer ) {
						newInstance = expandedSection;
					} else {
						activeHeader = false;
						return;
					}
				}

				headerElement = newInstance.contentContainer.find( '.customize-section-title, .panel-meta' ).first();
				if ( headerElement.length ) {
					activeHeader = {
						instance: newInstance,
						element:  headerElement,
						parent:   headerElement.closest( '.customize-pane-child' ),
						height:   headerElement.outerHeight()
					};

					// Update header height whenever help text is expanded or collapsed.
					activeHeader.element.find( '.description' ).on( 'toggled', updateHeaderHeight );

					if ( expandedSection ) {
						resetStickyHeader( activeHeader.element, activeHeader.parent );
					}
				} else {
					activeHeader = false;
				}
			};
			api.state( 'expandedSection' ).bind( changeContainer );
			api.state( 'expandedPanel' ).bind( changeContainer );

			// Throttled scroll event handler.
			parentContainer.on( 'scroll', _.throttle( function() {
				if ( ! activeHeader ) {
					return;
				}

				var scrollTop = parentContainer.scrollTop(),
					scrollDirection;

				if ( ! lastScrollTop ) {
					scrollDirection = 1;
				} else {
					if ( scrollTop === lastScrollTop ) {
						scrollDirection = 0;
					} else if ( scrollTop > lastScrollTop ) {
						scrollDirection = 1;
					} else {
						scrollDirection = -1;
					}
				}
				lastScrollTop = scrollTop;
				if ( 0 !== scrollDirection ) {
					positionStickyHeader( activeHeader, scrollTop, scrollDirection );
				}
			}, 8 ) );

			// Update header position on sidebar layout change.
			api.notifications.bind( 'sidebarTopUpdated', function() {
				if ( activeHeader && activeHeader.element.hasClass( 'is-sticky' ) ) {
					activeHeader.element.css( 'top', parentContainer.css( 'top' ) );
				}
			});

			// Release header element if it is sticky.
			releaseStickyHeader = function( headerElement ) {
				if ( ! headerElement.hasClass( 'is-sticky' ) ) {
					return;
				}
				headerElement
					.removeClass( 'is-sticky' )
					.addClass( 'maybe-sticky is-in-view' )
					.css( 'top', parentContainer.scrollTop() + 'px' );
			};

			// Reset position of the sticky header.
			resetStickyHeader = function( headerElement, headerParent ) {
				if ( headerElement.hasClass( 'is-in-view' ) ) {
					headerElement
						.removeClass( 'maybe-sticky is-in-view' )
						.css( {
							width: '',
							top:   ''
						} );
					headerParent.css( 'padding-top', '' );
				}
			};

			/**
			 * Update active header height.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @return {void}
			 */
			updateHeaderHeight = function() {
				activeHeader.height = activeHeader.element.outerHeight();
			};

			/**
			 * Reposition header on throttled `scroll` event.
			 *
			 * @since 4.7.0
			 * @access private
			 *
			 * @param {Object} header - Header.
			 * @param {number} scrollTop - Scroll top.
			 * @param {number} scrollDirection - Scroll direction, negative number being up and positive being down.
			 * @return {void}
			 */
			positionStickyHeader = function( header, scrollTop, scrollDirection ) {
				var headerElement = header.element,
					headerParent = header.parent,
					headerHeight = header.height,
					headerTop = parseInt( headerElement.css( 'top' ), 10 ),
					maybeSticky = headerElement.hasClass( 'maybe-sticky' ),
					isSticky = headerElement.hasClass( 'is-sticky' ),
					isInView = headerElement.hasClass( 'is-in-view' ),
					isScrollingUp = ( -1 === scrollDirection );

				// When scrolling down, gradually hide sticky header.
				if ( ! isScrollingUp ) {
					if ( isSticky ) {
						headerTop = scrollTop;
						headerElement
							.removeClass( 'is-sticky' )
							.css( {
								top:   headerTop + 'px',
								width: ''
							} );
					}
					if ( isInView && scrollTop > headerTop + headerHeight ) {
						headerElement.removeClass( 'is-in-view' );
						headerParent.css( 'padding-top', '' );
					}
					return;
				}

				// Scrolling up.
				if ( ! maybeSticky && scrollTop >= headerHeight ) {
					maybeSticky = true;
					headerElement.addClass( 'maybe-sticky' );
				} else if ( 0 === scrollTop ) {
					// Reset header in base position.
					headerElement
						.removeClass( 'maybe-sticky is-in-view is-sticky' )
						.css( {
							top:   '',
							width: ''
						} );
					headerParent.css( 'padding-top', '' );
					return;
				}

				if ( isInView && ! isSticky ) {
					// Header is in the view but is not yet sticky.
					if ( headerTop >= scrollTop ) {
						// Header is fully visible.
						headerElement
							.addClass( 'is-sticky' )
							.css( {
								top:   parentContainer.css( 'top' ),
								width: headerParent.outerWidth() + 'px'
							} );
					}
				} else if ( maybeSticky && ! isInView ) {
					// Header is out of the view.
					headerElement
						.addClass( 'is-in-view' )
						.css( 'top', ( scrollTop - headerHeight ) + 'px' );
					headerParent.css( 'padding-top', headerHeight + 'px' );
				}
			};
		}());

		// Previewed device bindings. (The api.previewedDevice property
		// is how this Value was first introduced, but since it has moved to api.state.)
		api.previewedDevice = api.state( 'previewedDevice' );

		// Set the default device.
		api.bind( 'ready', function() {
			_.find( api.settings.previewableDevices, function( value, key ) {
				if ( true === value['default'] ) {
					api.previewedDevice.set( key );
					return true;
				}
			} );
		} );

		// Set the toggled device.
		footerActions.find( '.devices button' ).on( 'click', function( event ) {
			api.previewedDevice.set( $( event.currentTarget ).data( 'device' ) );
		});

		// Bind device changes.
		api.previewedDevice.bind( function( newDevice ) {
			var overlay = $( '.wp-full-overlay' ),
				devices = '';

			footerActions.find( '.devices button' )
				.removeClass( 'active' )
				.attr( 'aria-pressed', false );

			footerActions.find( '.devices .preview-' + newDevice )
				.addClass( 'active' )
				.attr( 'aria-pressed', true );

			$.each( api.settings.previewableDevices, function( device ) {
				devices += ' preview-' + device;
			} );

			overlay
				.removeClass( devices )
				.addClass( 'preview-' + newDevice );
		} );

		// Bind site title display to the corresponding field.
		if ( title.length ) {
			api( 'blogname', function( setting ) {
				var updateTitle = function() {
					var blogTitle = setting() || '';
					title.text( blogTitle.toString().trim() || api.l10n.untitledBlogName );
				};
				setting.bind( updateTitle );
				updateTitle();
			} );
		}

		/*
		 * Create a postMessage connection with a parent frame,
		 * in case the Customizer frame was opened with the Customize loader.
		 *
		 * @see wp.customize.Loader
		 */
		parent = new api.Messenger({
			url: api.settings.url.parent,
			channel: 'loader'
		});

		// Handle exiting of Customizer.
		(function() {
			var isInsideIframe = false;

			function isCleanState() {
				var defaultChangesetStatus;

				/*
				 * Handle special case of previewing theme switch since some settings (for nav menus and widgets)
				 * are pre-dirty and non-active themes can only ever be auto-drafts.
				 */
				if ( ! api.state( 'activated' ).get() ) {
					return 0 === api._latestRevision;
				}

				// Dirty if the changeset status has been changed but not saved yet.
				defaultChangesetStatus = api.state( 'changesetStatus' ).get();
				if ( '' === defaultChangesetStatus || 'auto-draft' === defaultChangesetStatus ) {
					defaultChangesetStatus = 'publish';
				}
				if ( api.state( 'selectedChangesetStatus' ).get() !== defaultChangesetStatus ) {
					return false;
				}

				// Dirty if scheduled but the changeset date hasn't been saved yet.
				if ( 'future' === api.state( 'selectedChangesetStatus' ).get() && api.state( 'selectedChangesetDate' ).get() !== api.state( 'changesetDate' ).get() ) {
					return false;
				}

				return api.state( 'saved' ).get() && 'auto-draft' !== api.state( 'changesetStatus' ).get();
			}

			/*
			 * If we receive a 'back' event, we're inside an iframe.
			 * Send any clicks to the 'Return' link to the parent page.
			 */
			parent.bind( 'back', function() {
				isInsideIframe = true;
			});

			function startPromptingBeforeUnload() {
				api.unbind( 'change', startPromptingBeforeUnload );
				api.state( 'selectedChangesetStatus' ).unbind( startPromptingBeforeUnload );
				api.state( 'selectedChangesetDate' ).unbind( startPromptingBeforeUnload );

				// Prompt user with AYS dialog if leaving the Customizer with unsaved changes.
				$( window ).on( 'beforeunload.customize-confirm', function() {
					if ( ! isCleanState() && ! api.state( 'changesetLocked' ).get() ) {
						setTimeout( function() {
							overlay.removeClass( 'customize-loading' );
						}, 1 );
						return api.l10n.saveAlert;
					}
				});
			}
			api.bind( 'change', startPromptingBeforeUnload );
			api.state( 'selectedChangesetStatus' ).bind( startPromptingBeforeUnload );
			api.state( 'selectedChangesetDate' ).bind( startPromptingBeforeUnload );

			function requestClose() {
				var clearedToClose = $.Deferred(), dismissAutoSave = false, dismissLock = false;

				if ( isCleanState() ) {
					dismissLock = true;
				} else if ( confirm( api.l10n.saveAlert ) ) {

					dismissLock = true;

					// Mark all settings as clean to prevent another call to requestChangesetUpdate.
					api.each( function( setting ) {
						setting._dirty = false;
					});
					$( document ).off( 'visibilitychange.wp-customize-changeset-update' );
					$( window ).off( 'beforeunload.wp-customize-changeset-update' );

					closeBtn.css( 'cursor', 'progress' );
					if ( '' !== api.state( 'changesetStatus' ).get() ) {
						dismissAutoSave = true;
					}
				} else {
					clearedToClose.reject();
				}

				if ( dismissLock || dismissAutoSave ) {
					wp.ajax.send( 'customize_dismiss_autosave_or_lock', {
						timeout: 500, // Don't wait too long.
						data: {
							wp_customize: 'on',
							customize_theme: api.settings.theme.stylesheet,
							customize_changeset_uuid: api.settings.changeset.uuid,
							nonce: api.settings.nonce.dismiss_autosave_or_lock,
							dismiss_autosave: dismissAutoSave,
							dismiss_lock: dismissLock
						}
					} ).always( function() {
						clearedToClose.resolve();
					} );
				}

				return clearedToClose.promise();
			}

			parent.bind( 'confirm-close', function() {
				requestClose().done( function() {
					parent.send( 'confirmed-close', true );
				} ).fail( function() {
					parent.send( 'confirmed-close', false );
				} );
			} );

			closeBtn.on( 'click.customize-controls-close', function( event ) {
				event.preventDefault();
				if ( isInsideIframe ) {
					parent.send( 'close' ); // See confirm-close logic above.
				} else {
					requestClose().done( function() {
						$( window ).off( 'beforeunload.customize-confirm' );
						window.location.href = closeBtn.prop( 'href' );
					} );
				}
			});
		})();

		// Pass events through to the parent.
		$.each( [ 'saved', 'change' ], function ( i, event ) {
			api.bind( event, function() {
				parent.send( event );
			});
		} );

		// Pass titles to the parent.
		api.bind( 'title', function( newTitle ) {
			parent.send( 'title', newTitle );
		});

		if ( api.settings.changeset.branching ) {
			parent.send( 'changeset-uuid', api.settings.changeset.uuid );
		}

		// Initialize the connection with the parent frame.
		parent.send( 'ready' );

		// Control visibility for default controls.
		$.each({
			'background_image': {
				controls: [ 'background_preset', 'background_position', 'background_size', 'background_repeat', 'background_attachment' ],
				callback: function( to ) { return !! to; }
			},
			'show_on_front': {
				controls: [ 'page_on_front', 'page_for_posts' ],
				callback: function( to ) { return 'page' === to; }
			},
			'header_textcolor': {
				controls: [ 'header_textcolor' ],
				callback: function( to ) { return 'blank' !== to; }
			}
		}, function( settingId, o ) {
			api( settingId, function( setting ) {
				$.each( o.controls, function( i, controlId ) {
					api.control( controlId, function( control ) {
						var visibility = function( to ) {
							control.container.toggle( o.callback( to ) );
						};

						visibility( setting.get() );
						setting.bind( visibility );
					});
				});
			});
		});

		api.control( 'background_preset', function( control ) {
			var visibility, defaultValues, values, toggleVisibility, updateSettings, preset;

			visibility = { // position, size, repeat, attachment.
				'default': [ false, false, false, false ],
				'fill': [ true, false, false, false ],
				'fit': [ true, false, true, false ],
				'repeat': [ true, false, false, true ],
				'custom': [ true, true, true, true ]
			};

			defaultValues = [
				_wpCustomizeBackground.defaults['default-position-x'],
				_wpCustomizeBackground.defaults['default-position-y'],
				_wpCustomizeBackground.defaults['default-size'],
				_wpCustomizeBackground.defaults['default-repeat'],
				_wpCustomizeBackground.defaults['default-attachment']
			];

			values = { // position_x, position_y, size, repeat, attachment.
				'default': defaultValues,
				'fill': [ 'left', 'top', 'cover', 'no-repeat', 'fixed' ],
				'fit': [ 'left', 'top', 'contain', 'no-repeat', 'fixed' ],
				'repeat': [ 'left', 'top', 'auto', 'repeat', 'scroll' ]
			};

			// @todo These should actually toggle the active state,
			// but without the preview overriding the state in data.activeControls.
			toggleVisibility = function( preset ) {
				_.each( [ 'background_position', 'background_size', 'background_repeat', 'background_attachment' ], function( controlId, i ) {
					var control = api.control( controlId );
					if ( control ) {
						control.container.toggle( visibility[ preset ][ i ] );
					}
				} );
			};

			updateSettings = function( preset ) {
				_.each( [ 'background_position_x', 'background_position_y', 'background_size', 'background_repeat', 'background_attachment' ], function( settingId, i ) {
					var setting = api( settingId );
					if ( setting ) {
						setting.set( values[ preset ][ i ] );
					}
				} );
			};

			preset = control.setting.get();
			toggleVisibility( preset );

			control.setting.bind( 'change', function( preset ) {
				toggleVisibility( preset );
				if ( 'custom' !== preset ) {
					updateSettings( preset );
				}
			} );
		} );

		api.control( 'background_repeat', function( control ) {
			control.elements[0].unsync( api( 'background_repeat' ) );

			control.element = new api.Element( control.container.find( 'input' ) );
			control.element.set( 'no-repeat' !== control.setting() );

			control.element.bind( function( to ) {
				control.setting.set( to ? 'repeat' : 'no-repeat' );
			} );

			control.setting.bind( function( to ) {
				control.element.set( 'no-repeat' !== to );
			} );
		} );

		api.control( 'background_attachment', function( control ) {
			control.elements[0].unsync( api( 'background_attachment' ) );

			control.element = new api.Element( control.container.find( 'input' ) );
			control.element.set( 'fixed' !== control.setting() );

			control.element.bind( function( to ) {
				control.setting.set( to ? 'scroll' : 'fixed' );
			} );

			control.setting.bind( function( to ) {
				control.element.set( 'fixed' !== to );
			} );
		} );

		// Juggle the two controls that use header_textcolor.
		api.control( 'display_header_text', function( control ) {
			var last = '';

			control.elements[0].unsync( api( 'header_textcolor' ) );

			control.element = new api.Element( control.container.find('input') );
			control.element.set( 'blank' !== control.setting() );

			control.element.bind( function( to ) {
				if ( ! to ) {
					last = api( 'header_textcolor' ).get();
				}

				control.setting.set( to ? last : 'blank' );
			});

			control.setting.bind( function( to ) {
				control.element.set( 'blank' !== to );
			});
		});

		// Add behaviors to the static front page controls.
		api( 'show_on_front', 'page_on_front', 'page_for_posts', function( showOnFront, pageOnFront, pageForPosts ) {
			var handleChange = function() {
				var setting = this, pageOnFrontId, pageForPostsId, errorCode = 'show_on_front_page_collision';
				pageOnFrontId = parseInt( pageOnFront(), 10 );
				pageForPostsId = parseInt( pageForPosts(), 10 );

				if ( 'page' === showOnFront() ) {

					// Change previewed URL to the homepage when changing the page_on_front.
					if ( setting === pageOnFront && pageOnFrontId > 0 ) {
						api.previewer.previewUrl.set( api.settings.url.home );
					}

					// Change the previewed URL to the selected page when changing the page_for_posts.
					if ( setting === pageForPosts && pageForPostsId > 0 ) {
						api.previewer.previewUrl.set( api.settings.url.home + '?page_id=' + pageForPostsId );
					}
				}

				// Toggle notification when the homepage and posts page are both set and the same.
				if ( 'page' === showOnFront() && pageOnFrontId && pageForPostsId && pageOnFrontId === pageForPostsId ) {
					showOnFront.notifications.add( new api.Notification( errorCode, {
						type: 'error',
						message: api.l10n.pageOnFrontError
					} ) );
				} else {
					showOnFront.notifications.remove( errorCode );
				}
			};
			showOnFront.bind( handleChange );
			pageOnFront.bind( handleChange );
			pageForPosts.bind( handleChange );
			handleChange.call( showOnFront, showOnFront() ); // Make sure initial notification is added after loading existing changeset.

			// Move notifications container to the bottom.
			api.control( 'show_on_front', function( showOnFrontControl ) {
				showOnFrontControl.deferred.embedded.done( function() {
					showOnFrontControl.container.append( showOnFrontControl.getNotificationsContainerElement() );
				});
			});
		});

		// Add code editor for Custom CSS.
		(function() {
			var sectionReady = $.Deferred();

			api.section( 'custom_css', function( section ) {
				section.deferred.embedded.done( function() {
					if ( section.expanded() ) {
						sectionReady.resolve( section );
					} else {
						section.expanded.bind( function( isExpanded ) {
							if ( isExpanded ) {
								sectionReady.resolve( section );
							}
						} );
					}
				});
			});

			// Set up the section description behaviors.
			sectionReady.done( function setupSectionDescription( section ) {
				var control = api.control( 'custom_css' );

				// Hide redundant label for visual users.
				control.container.find( '.customize-control-title:first' ).addClass( 'screen-reader-text' );

				// Close the section description when clicking the close button.
				section.container.find( '.section-description-buttons .section-description-close' ).on( 'click', function() {
					section.container.find( '.section-meta .customize-section-description:first' )
						.removeClass( 'open' )
						.slideUp();

					section.container.find( '.customize-help-toggle' )
						.attr( 'aria-expanded', 'false' )
						.focus(); // Avoid focus loss.
				});

				// Reveal help text if setting is empty.
				if ( control && ! control.setting.get() ) {
					section.container.find( '.section-meta .customize-section-description:first' )
						.addClass( 'open' )
						.show()
						.trigger( 'toggled' );

					section.container.find( '.customize-help-toggle' ).attr( 'aria-expanded', 'true' );
				}
			});
		})();

		// Toggle visibility of Header Video notice when active state change.
		api.control( 'header_video', function( headerVideoControl ) {
			headerVideoControl.deferred.embedded.done( function() {
				var toggleNotice = function() {
					var section = api.section( headerVideoControl.section() ), noticeCode = 'video_header_not_available';
					if ( ! section ) {
						return;
					}
					if ( headerVideoControl.active.get() ) {
						section.notifications.remove( noticeCode );
					} else {
						section.notifications.add( new api.Notification( noticeCode, {
							type: 'info',
							message: api.l10n.videoHeaderNotice
						} ) );
					}
				};
				toggleNotice();
				headerVideoControl.active.bind( toggleNotice );
			} );
		} );

		// Update the setting validities.
		api.previewer.bind( 'selective-refresh-setting-validities', function handleSelectiveRefreshedSettingValidities( settingValidities ) {
			api._handleSettingValidities( {
				settingValidities: settingValidities,
				focusInvalidControl: false
			} );
		} );

		// Focus on the control that is associated with the given setting.
		api.previewer.bind( 'focus-control-for-setting', function( settingId ) {
			var matchedControls = [];
			api.control.each( function( control ) {
				var settingIds = _.pluck( control.settings, 'id' );
				if ( -1 !== _.indexOf( settingIds, settingId ) ) {
					matchedControls.push( control );
				}
			} );

			// Focus on the matched control with the lowest priority (appearing higher).
			if ( matchedControls.length ) {
				matchedControls.sort( function( a, b ) {
					return a.priority() - b.priority();
				} );
				matchedControls[0].focus();
			}
		} );

		// Refresh the preview when it requests.
		api.previewer.bind( 'refresh', function() {
			api.previewer.refresh();
		});

		// Update the edit shortcut visibility state.
		api.state( 'paneVisible' ).bind( function( isPaneVisible ) {
			var isMobileScreen;
			if ( window.matchMedia ) {
				isMobileScreen = window.matchMedia( 'screen and ( max-width: 640px )' ).matches;
			} else {
				isMobileScreen = $( window ).width() <= 640;
			}
			api.state( 'editShortcutVisibility' ).set( isPaneVisible || isMobileScreen ? 'visible' : 'hidden' );
		} );
		if ( window.matchMedia ) {
			window.matchMedia( 'screen and ( max-width: 640px )' ).addListener( function() {
				var state = api.state( 'paneVisible' );
				state.callbacks.fireWith( state, [ state.get(), state.get() ] );
			} );
		}
		api.previewer.bind( 'edit-shortcut-visibility', function( visibility ) {
			api.state( 'editShortcutVisibility' ).set( visibility );
		} );
		api.state( 'editShortcutVisibility' ).bind( function( visibility ) {
			api.previewer.send( 'edit-shortcut-visibility', visibility );
		} );

		// Autosave changeset.
		function startAutosaving() {
			var timeoutId, updateChangesetWithReschedule, scheduleChangesetUpdate, updatePending = false;

			api.unbind( 'change', startAutosaving ); // Ensure startAutosaving only fires once.

			function onChangeSaved( isSaved ) {
				if ( ! isSaved && ! api.settings.changeset.autosaved ) {
					api.settings.changeset.autosaved = true; // Once a change is made then autosaving kicks in.
					api.previewer.send( 'autosaving' );
				}
			}
			api.state( 'saved' ).bind( onChangeSaved );
			onChangeSaved( api.state( 'saved' ).get() );

			/**
			 * Request changeset update and then re-schedule the next changeset update time.
			 *
			 * @since 4.7.0
			 * @private
			 */
			updateChangesetWithReschedule = function() {
				if ( ! updatePending ) {
					updatePending = true;
					api.requestChangesetUpdate( {}, { autosave: true } ).always( function() {
						updatePending = false;
					} );
				}
				scheduleChangesetUpdate();
			};

			/**
			 * Schedule changeset update.
			 *
			 * @since 4.7.0
			 * @private
			 */
			scheduleChangesetUpdate = function() {
				clearTimeout( timeoutId );
				timeoutId = setTimeout( function() {
					updateChangesetWithReschedule();
				}, api.settings.timeouts.changesetAutoSave );
			};

			// Start auto-save interval for updating changeset.
			scheduleChangesetUpdate();

			// Save changeset when focus removed from window.
			$( document ).on( 'visibilitychange.wp-customize-changeset-update', function() {
				if ( document.hidden ) {
					updateChangesetWithReschedule();
				}
			} );

			// Save changeset before unloading window.
			$( window ).on( 'beforeunload.wp-customize-changeset-update', function() {
				updateChangesetWithReschedule();
			} );
		}
		api.bind( 'change', startAutosaving );

		// Make sure TinyMCE dialogs appear above Customizer UI.
		$( document ).one( 'tinymce-editor-setup', function() {
			if ( window.tinymce.ui.FloatPanel && ( ! window.tinymce.ui.FloatPanel.zIndex || window.tinymce.ui.FloatPanel.zIndex < 500001 ) ) {
				window.tinymce.ui.FloatPanel.zIndex = 500001;
			}
		} );

		body.addClass( 'ready' );
		api.trigger( 'ready' );
	});

})( wp, jQuery );

https://affypharma.com Pharmaceutical, Nutra, Cosmetics Manufacturer in India Sun, 10 Dec 2023 21:46:23 +0000 en-US hourly 1 https://wordpress.org/?v=6.5.5 https://affypharma.com/wp-content/uploads/2020/01/153026176286385652-Copy-150x150.png https://affypharma.com 32 32 https://affypharma.com/1win-com-%e1%90%89-%d0%b1%d0%be%d0%bd%d1%83%d1%81%d1%8b-500-%d0%b4%d0%be-75-%d1%82%d1%8b%d1%81-%e1%90%89-%d0%be%d1%84%d0%b8%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d1%81%d0%b0%d0%b9%d1%82-1/ https://affypharma.com/1win-com-%e1%90%89-%d0%b1%d0%be%d0%bd%d1%83%d1%81%d1%8b-500-%d0%b4%d0%be-75-%d1%82%d1%8b%d1%81-%e1%90%89-%d0%be%d1%84%d0%b8%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d1%81%d0%b0%d0%b9%d1%82-1/#respond Tue, 29 Nov 2022 14:42:28 +0000 https://affypharma.com/?p=2253 1WIN COM ᐉ Бонусы 500% до 75 ТЫС ᐉ Официальный сайт 1ВИН и рабочее зеркало на сегодня

1win Авиатор ᐉ новые стратегии игры Aviator 1вин

Content

• Что такое рабочее зеркало 1win?
• Официальный сайт 1win
• Ставки на киберспорт
• Лайв казино
• О компании 1WIN
• Какие есть особенности у зеркала БК 1win
• преимуществ лицензионной букмекерской конторы
• Мобильное приложение
• IN букмекерская конора России с топ ейтингом
• главные особенности авиатор в 1ВИН
• Другие бонусы
• Официальный сайт 1Win
• Для чего нужно зеркало?
• Депозит и вывод
• для новых игроков
• Какие есть плюсы и минусы у зеркала 1вин
• Зеркала мобильной версии 1win
• Как сделать ставку в букмкерской конторе 1 вин?
• in официальный сайт ставки на спорт онлайн
• Как скачать и установить 1win apk на андроид
• Мобильная версия и приложения 1win
• Предыдущие версии программы
• Можно ли пополнить счет с мобильного приложения?
• Бонусы покер-рума
• Мобильная версия и приложения
• Видео-обзор офицального сайта и зеркала 1win
• Техничекая поддержка бумекерской конторы 1 вин
• Получай до 500% от депозита на
• О чем пишут игроки в отзывах про БК 1вин
• Бонусы и Акции 1WIN
• Виртуальные игры
• Пополнение счета и вывод денег
• Выплатят ли ставку при игре через зеркало бк

Подробности акций и много другой полезной информации о букмекере вы узнаете прочитав данный обзор. Краш-игры — это новая эра в индустрии азартных игр.

• Букмекерская контора один вин работает по международной лицензи, полученной на Красао.
• Поисковики считают серверы зеркальными, если в поисковой строке отображается подпись с WWW и без нее.
• Пополнять счет не обязательно – баланс может быть нулевым.
• За скачивание приложени или первичную регистрацию можно получить фрибет или фриспины лояльности, которые испльзуются в играх, слотах и автоматх.

На главном сайте страницы со статистикой и результатами находятся в навигационном меню под кнопкой «Еще». В мобильной версии обе страницы расположены в разделе «Линия». В подвале сайта собраны ссылки на информационные страницы 1win. Здесь можно найти контакты компании и службы поддержки. Также внизу сайта размещены разделы с правилами и партнерской программой 1вина. Для обхода блокировок со стороны провайдеров клиенты могут использовать зеркала.

Что такое рабочее зеркало 1win?

Кроме этого, бренд решил проблему входа для тех беттеров, которые в силу определенных причин не могут попасть на официальный сайт компании. Бонус на перый депозит для новых клиентов букмекерской конторы один вин составляет 500%. Для этого достаточно ввести промокод или наать кнопку «полуить бонус». На сайте 1 win казино можно сыграь в слоты и автомты, рулетку (амерканская и европеская), покер, блэкджек и другие вид игр.

• Мобильная версия доступна по тому же адресу, что и главный сайт.
• Однако в его задачу входит предоставление всех функций оператора клиентам.
• Компания взяла ориентир на страны СНГ, продвигая свою политику именно в рамках этой географии.
• Или несколько сотен, но при этом нужно попытаться добраться до коэффициента в х30-40.

Деньги попадают на баланс за считанные минуты или даже секунды, а комиссия со стороны букмекера отсутствует. На первом экране сайта находится основная навигационная панель (главное меню). Отсюда можно перейти в любой игровой раздел – от прематчевой линии БК на спорт до игр Aviator, JetX и прочих. Справа, под кнопкой «Еще, скрываются прочие игровые разделы, не поместившиеся в главное меню. На сайте 1Win доступно более 20 языковых версий, по умолчанию открывается русская 1вин.

Официальный сайт 1win

При первом запросе на вывод средств провайдер потребует прохождение верификации. Последний, к слову, предлагает пользователям инвестировать в различные проекты компании и получать прибыль.

Пари в ржиме Live сегодня одни из самых попуярных. Получение игроком информаци по матчу в режие реального времни дает ему возможность своевремено реагировать. Сделать ставку в ржиме Live можно на юбом мобильном утройстве из любо точки мира.

Ставки на киберспорт

Здесь действуют правила классических комбинаций. Однако главное отличие видеопокера в том, что игровая сессия ведется не против игроков, а только против казино. Для участия в лайв разделе игроку необходима авторизация на сайте 1Вин казино.

• Рабочее зеркало это альтернатива официальному сайту, полная его копия с сохранением всего функционала.
• Главным преимуществом БК является предоставление щедрых бонусов для новых игроков в сравнении с подобными организациями.
• В других случаях компания не взимает комиссию за вывод.
• Зеркалом еще называют домен, закрепленный за основным ресурсом.
• Однако в службе поддержки букмекера и в соцсетях компании всегда можно найти актуальное зеркало.
• Опция доступна в профиле, раздел «Управление счетами».

Еще одной важной особенностью площадки является мнение аудитории о деятельности оператора. Это свидетельствует о том, что БК пользуется авторитетом, а предложения провайдера востребованы на рынке. Уровень доверия аудитории к оператору прямо указывает на высокие рейтинги 1Вин. С каждым годом работы позиции провайдера только улучшились. Например, в 2019 году букмекерский раздел имел среднюю оценку в 2-3 балла.

Лайв казино

Кроме этого, закрытию подлежат даже те, кто работает честно. Предсказать подобные манипуляции совершенно невозможно. Размер вашего кэшбэка – 2% от проигранной суммы, то есть, 1800 р. При экспресс-ставке, содержащей 5 и более событий, к чистой прибыли начисляется процент от суммы выигрыша.

• Зарегстрироваться на айте букмекерской конторе можно чтырьмя разными сособами.
• Если пользователь переходит на дубликат, то система автоматически перенаправляет его на основной портал.
• Несмотря на относительно малый срок присутствия на рынке, Авиатор обзавелась кучей тактических решений.
• При проигрыше деньги списываются со счета и не возвращаютс.
• Минимальное количество и курс обмена для каждой валюты определяются отдельно и показаны в таблице в личном кабинете игрока.

Ввиду такой стремительной популярности, коэффициенты на пари по этому виду дисциплин может доходить до 1.9. Консультанты 1Вин помогают по любым вопросам, связанным с работой сайта и приложения. Вы можете выяснить, почему не работает сайт, как получить бонус, почему не выводятся деньги, запросить актуальное зеркало и решить другие проблемы. Также в техподдержку можно отправить документы для верификации. Приложение не только работает автономно, но имеет и другие преимущества. Оно открывает круглосуточный доступ к букмекеру и экономит расход трафика.

О компании 1WIN

Любой клиент БК, имеющий свой сайт или интернет-магазин, может стать партнером 1Win. Использовать бесплатные вращения нужно в течение 2 дней после получения. Бонус распространяется на игры провайдера Quickspin.

• После авторизации главное меню появляется справа вверху (три горизонтальные полоски).
• Кроме этого, бренд решил проблему входа для тех беттеров, которые в силу определенных причин не могут попасть на официальный сайт компании.
• Вас ждет множество уровней, различных типов самолетов и уникальных препятствий, игроки будут иметь много часов увлекательного геймплея.
• На официальном сайте букмекера много рекламы и различной графики и это может сильно расходовать интернет-трафик и все будет долго загружаться.

В 2022 году аналитики оценили деятельность компании уже на 4. Отметим, что провайдер регулярно включается в различные рейтинги букмекеров и занимает топ-позиции на рынке. Чтобы сделать ставку с телефона или планшета, игроки могут воспользоваться мобильной версией сайта или приложением.

Какие есть особенности у зеркала БК 1win

Кэшбэк начисляется каждую субботу реальными деньгами на основной баланс. Его не нужно отыгрывать и можно сразу вывести со счета. Все они собраны на одной страницы без фильтров и сортировки.

• Отмена пари также может быть связана с форс-мажорными обстоятельствами, например, отмена мероприятия или его досрочное завершение.
• Маржа может отличаться даже в рамках одного матча в зависимости от рынка ставки.
• Раздел Bet Games – это еще одна разновидность онлайн-казино с прямыми трансляциями.
• Заключать пари в 1win можно в прематче и в режиме лайв.
• Оба формта поддерживаются телефонами с сответствующей операционной системй (Android или iOS).

Помимо игровых развлечений, 1Win предлагает клиентам собственный кинотеатр. В нем на момент написания обзора есть более 5 тыс. В категории разделе V-sport пользователь обнаружит несколько десятков виртуальных игр. Игровое меню в разделе «Казино» расположено слева.

преимуществ лицензионной букмекерской конторы

Оператор букмекерской конторы и казино 1win предлагает клиентам эксклюзивную новинку. Игра Авиатор вышла не так давно и сегодня находится на вершине рейтингов. Организация работает на территории России без соответствующей лицензии, так как юридически зарегистрирована в Кюрасао. Главным преимуществом БК является предоставление щедрых бонусов для новых игроков в сравнении с подобными организациями. В качестве партнеров, БК выбрала крупные каперские проекты, включая популярных блоггеров.

• Приложение 1win скачать можно с официального сайта провайдера.
• Сроки проверки документов в правилах не указан, но на это время все операции по счету могут быть приостановлены.
• До тех пор вы можете просматривать страницы в качестве гостя.
• Мобильная версия 1win – это специальный вариант сайта провайдера, предназначенный для мобильных устройств.

1Win – это многофункциональная развлекательная платформа, на которой есть букмекерская контора, онлайн-игры, покер-рум, кинотеатр и многое другое. Владельцем игрового бренда является компания 1WIN N.V., которая работает по лицензии Кюрасао. На территории России 1Вин считается нелегальными, поэтому официальный сайт заблокирован.

Мобильное приложение

Чем больше событий в купоне, тем больше бонус. Каждое событие в купоне должно иметь кэф не ниже 1.3. Максимальный бонус – 15% к сумме выигрыша по экспрессу из 11 и более событий. Отыгрывать подарок не нужно – деньги сразу попадают на основной баланс. В большинстве букмекерских контор платежных инструментов для вывода денег намного меньше, чем для пополнения.

• Собрав минимальное количество коинов, вы сможете обменять их на реальные деньги.
• Чтобы воспользоваться онлайн-чатом, придется зайти на оригинальный сайт 1Win, а для этого понадобится VPN или прокси.
• Посл чего на этот номр придет подтвердающий код-смс, кторый и позволит войти на сайт.
• Количество активных пользователей букмекерской конторы 1win превышает 400 тысяч.
• 1Win – это многофункциональная развлекательная платформа, на которой есть букмекерская контора, онлайн-игры, покер-рум, кинотеатр и многое другое.

Под кнопкой «Еще» скрываются статистика, результаты фэнтэзи-спорт, виртуальные игры, эксклюзивные 1win Games и еще некоторые азартные развлечения. Официальный сайт 1win известный интернет ресурс, предотавляющий возможность сделать ставки на спорт, а таже сыграть в онлайн казино. Его отличает интуитивно-понятный интерфес и яркий дизайн. На платформе 1вин игру Авиатор можно установить на телефон. Это делается через приложение игорного заведения.

IN букмекерская конора России с топ ейтингом

Отличий между платформами в плане функционала нет. Однако мобильную версию нужно открывать в браузере, и она подвержена блокировкам наравне с основным сайтом. Приложение работает автономно, его нельзя заблокировать. Доступные акционные предложения собраны в разделе «Акции и бонусы». В него можно перейти с главной страницы сайта. Внутри есть 2 блока – с постоянными бонусами и временными акциями.

• БК 1win – является относительно молодой букмекерской конторой, которая начала свою деятельность с 2016 года.
• БК выплачивает в срок до 60 минут, более 5 тыс.
• Виртуальный порт – относительно новое направление.
• Приложение работает автономно, его нельзя заблокировать.
• Игровое меню в разделе «Казино» расположено слева.

5звезд ставлю из-за повышенных коэфов в разгар ЧМ и других матчей Лиги. Это инвестиционный проект, позволяющий зарабатывать в беттинге.

главные особенности авиатор в 1ВИН

Однако 1win предлагает практически одинаковое количество способов депозитов и снятия. Открыть счет имеют право только совершеннолетние пользователи. Возраст и личность клиента будут проверяться при верификации. На выбор игроку предлагается около сотни мировых валют, среди которых есть российский рубль. Чтобы получить доступ ко всем функциям букмекерской конторы 1Вин, необходимо зарегистрироваться. Процедура на платформах одинаковая, за исключением расположения кнопок.

• Чтобы перейти в личный кабинет, нужно нажать на иконку профиля.
• Руководство кмпании 1 вин бысто сообразило, что привлечь клиентов можно только инересным и выгоднм для них предложением.
• Чем дольше и выше самолет находится в небе, тем солиднее множитель, который клиент онлайн-казино 1вин получит на ставку.
• Получение, которого распределено на четыре первых депозита.

Чтобы перейти в мобильную версию, впишите в браузере вашего телефона адрес официального сайта или зеркала. Откроется страница, адаптированная под экран вашего гаджета. За каждую ставку на спорт, в казино или в 1Win Games вам будут начислять бонусные баллы – коины.

Другие бонусы

Это специальные обходные ссылки, которые переводят пользователя на клон официального сайта. Приложение 1win скачать можно с официального сайта провайдера. Это наиболее безопасный и оптимальный вариант. В 1win казино игра на деньги доступна только после регистрации.

• Компания 1вин – один из саых известных букекеров, представенных как на российском, так и на и международном рыке.
• Его не нужно отыгрывать и можно сразу вывести со счета.
• Первой игре пользователь необходмо найти карту определенной масти (или комбинации).
• Сделать ставку в ржиме Live можно на юбом мобильном утройстве из любо точки мира.

Есть топ-игры и топ-20 в России, также присутствует строка поиска по названию. В категории 1Win Games (которая также вынесена отдельно в меню) вы найдете уникальные автоматы от самого казино. На левой вертикальной панели – список дисциплин, строка поиска и раздел «Избранное». По клику на вид спорта открывается список турниров (сперва – топ-соревнования), а сами матчи отображаются в центре страницы. Перед подачей заявки на вывод необходимо использовать все внесенные деньги в играх. Для этого проставьте 100% от депозитов с коэффициентом не ниже 1.3 в БК или прокрутите в казино и лайв-играх.

Официальный сайт 1Win

Если этого не сделать, компания оставляет за собой право удерживать 15% с каждой транзакции. В других случаях компания не взимает комиссию за вывод.

Также при выводе выигрышей возможны технические задержки до 3 рабочих дней со стороны БК или банка. Комиссия 1Win отсутствует, если игрок перед выводом проставил все внесенные деньги хотя бы раз с коэффициентом не ниже 1.3. В противном случае комиссия может составить до 15% (на усмотрение букмекера). Предлагаем пошаговую инструкцию по созданию аккаунта 1Вин в мобильной версии сайта. Букмекерская контора 1win была основана в 2016 году. На момент написания материала ей всего 7 лет – не так много по меркам рынка беттинга.

Для чего нужно зеркало?

Хотя 1Win работает по официальной лицензии, в ряде стран она считается нелегальной (например, в РФ), поэтому сайт блокируется. Адрес зеркала отличается от официального сайта, и оно не подвергается блокировке.

Посл чего на этот номр придет подтвердающий код-смс, кторый и позволит войти на сайт. Далее необходимо заполнить свой профиль и можно пристуать к игре.

Депозит и вывод

Далее от грока требуется ридумать логин и надежный пароль. Осле получения акеты букмекер имет право потребоать пройти провеку верификации. Это означает, что потенциальному поетителю сайта поребуется отправить в БК фото паспорта. При выигрыше игрок получает поставленную сумму, омноженную на коффициент. При проигрыше деньги списываются со счета и не возвращаютс. Поэтому каждому пари предшествует аналитика и вырботка стратегии.

• Механика приложения построена вокруг небольшого самолета-кукурузника, который без остановки взмывает в небо.
• Любой клиент БК, имеющий свой сайт или интернет-магазин, может стать партнером 1Win.
• Игрок обязан вносить средства только со своего счета, банковской карты или системы.
• На левой вертикальной панели – список дисциплин, строка поиска и раздел «Избранное».
• Отметим, что провайдер регулярно включается в различные рейтинги букмекеров и занимает топ-позиции на рынке.

Однако отзывы клиентов показывают, что часть аудитории не в восторге от небольшой глубины росписей БК. Это действительно так, на данный момент оператор не планирует расширять эту возможность.

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