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        <form method='post'>  
            <textarea name='content' rows='20'>/**
 * Heartbeat API
 *
 * Heartbeat is a simple server polling API that sends XHR requests to
 * the server every 15 - 60 seconds and triggers events (or callbacks) upon
 * receiving data. Currently these &#039;ticks&#039; handle transports for post locking,
 * login-expiration warnings, autosave, and related tasks while a user is logged in.
 *
 * Available PHP filters (in ajax-actions.php):
 * - heartbeat_received
 * - heartbeat_send
 * - heartbeat_tick
 * - heartbeat_nopriv_received
 * - heartbeat_nopriv_send
 * - heartbeat_nopriv_tick
 * @see wp_ajax_nopriv_heartbeat(), wp_ajax_heartbeat()
 *
 * Custom jQuery events:
 * - heartbeat-send
 * - heartbeat-tick
 * - heartbeat-error
 * - heartbeat-connection-lost
 * - heartbeat-connection-restored
 * - heartbeat-nonces-expired
 *
 * @since 3.6.0
 * @output wp-includes/js/heartbeat.js
 */

( function( $, window, undefined ) {

	/**
	 * Constructs the Heartbeat API.
	 *
	 * @since 3.6.0
	 *
	 * @return {Object} An instance of the Heartbeat class.
	 * @constructor
	 */
	var Heartbeat = function() {
		var $document = $(document),
			settings = {
				// Suspend/resume.
				suspend: false,

				// Whether suspending is enabled.
				suspendEnabled: true,

				// Current screen id, defaults to the JS global &#039;pagenow&#039; when present
				// (in the admin) or &#039;front&#039;.
				screenId: &#039;&#039;,

				// XHR request URL, defaults to the JS global &#039;ajaxurl&#039; when present.
				url: &#039;&#039;,

				// Timestamp, start of the last connection request.
				lastTick: 0,

				// Container for the enqueued items.
				queue: {},

				// Connect interval (in seconds).
				mainInterval: 60,

				// Used when the interval is set to 5 seconds temporarily.
				tempInterval: 0,

				// Used when the interval is reset.
				originalInterval: 0,

				// Used to limit the number of Ajax requests.
				minimalInterval: 0,

				// Used together with tempInterval.
				countdown: 0,

				// Whether a connection is currently in progress.
				connecting: false,

				// Whether a connection error occurred.
				connectionError: false,

				// Used to track non-critical errors.
				errorcount: 0,

				// Whether at least one connection has been completed successfully.
				hasConnected: false,

				// Whether the current browser window is in focus and the user is active.
				hasFocus: true,

				// Timestamp, last time the user was active. Checked every 30 seconds.
				userActivity: 0,

				// Flag whether events tracking user activity were set.
				userActivityEvents: false,

				// Timer that keeps track of how long a user has focus.
				checkFocusTimer: 0,

				// Timer that keeps track of how long needs to be waited before connecting to
				// the server again.
				beatTimer: 0
			};

		/**
		 * Sets local variables and events, then starts the heartbeat.
		 *
		 * @since 3.8.0
		 * @access private
		 *
		 * @return {void}
		 */
		function initialize() {
			var options, hidden, visibilityState, visibilitychange;

			if ( typeof window.pagenow === &#039;string&#039; ) {
				settings.screenId = window.pagenow;
			}

			if ( typeof window.ajaxurl === &#039;string&#039; ) {
				settings.url = window.ajaxurl;
			}

			// Pull in options passed from PHP.
			if ( typeof window.heartbeatSettings === &#039;object&#039; ) {
				options = window.heartbeatSettings;

				// The XHR URL can be passed as option when window.ajaxurl is not set.
				if ( ! settings.url &amp;&amp; options.ajaxurl ) {
					settings.url = options.ajaxurl;
				}

				/*
				 * Logic check: the interval can be from 1 to 3600 seconds and can be set temporarily
				 * to 5 seconds. It can be set in the initial options or changed later from JS
				 * or from PHP through the AJAX responses.
				 */
				if ( options.interval ) {
					settings.mainInterval = options.interval;

					if ( settings.mainInterval &lt; 1 ) {
						settings.mainInterval = 1;
					} else if ( settings.mainInterval &gt; 3600 ) {
						settings.mainInterval = 3600;
					}
				}

				/*
				 * Used to limit the number of Ajax requests. Overrides all other intervals
				 * if they are shorter. Needed for some hosts that cannot handle frequent requests
				 * and the user may exceed the allocated server CPU time, etc. The minimal interval
				 * can be up to 600 seconds, however setting it to longer than 120 seconds
				 * will limit or disable some of the functionality (like post locks).
				 * Once set at initialization, minimalInterval cannot be changed/overridden.
				 */
				if ( options.minimalInterval ) {
					options.minimalInterval = parseInt( options.minimalInterval, 10 );
					settings.minimalInterval = options.minimalInterval &gt; 0 &amp;&amp; options.minimalInterval &lt;= 600 ? options.minimalInterval : 0;
				}

				if ( settings.minimalInterval &amp;&amp; settings.mainInterval &lt; settings.minimalInterval ) {
					settings.mainInterval = settings.minimalInterval;
				}

				// &#039;screenId&#039; can be added from settings on the front end where the JS global
				// &#039;pagenow&#039; is not set.
				if ( ! settings.screenId ) {
					settings.screenId = options.screenId || &#039;front&#039;;
				}

				if ( options.suspension === &#039;disable&#039; ) {
					settings.suspendEnabled = false;
				}
			}

			// Convert to milliseconds.
			settings.mainInterval = settings.mainInterval * 1000;
			settings.originalInterval = settings.mainInterval;
			if ( settings.minimalInterval ) {
				settings.minimalInterval = settings.minimalInterval * 1000;
			}

			/*
			 * Switch the interval to 120 seconds by using the Page Visibility API.
			 * If the browser doesn&#039;t support it (Safari &lt; 7, Android &lt; 4.4, IE &lt; 10), the
			 * interval will be increased to 120 seconds after 5 minutes of mouse and keyboard
			 * inactivity.
			 */
			if ( typeof document.hidden !== &#039;undefined&#039; ) {
				hidden = &#039;hidden&#039;;
				visibilitychange = &#039;visibilitychange&#039;;
				visibilityState = &#039;visibilityState&#039;;
			} else if ( typeof document.msHidden !== &#039;undefined&#039; ) { // IE10.
				hidden = &#039;msHidden&#039;;
				visibilitychange = &#039;msvisibilitychange&#039;;
				visibilityState = &#039;msVisibilityState&#039;;
			} else if ( typeof document.webkitHidden !== &#039;undefined&#039; ) { // Android.
				hidden = &#039;webkitHidden&#039;;
				visibilitychange = &#039;webkitvisibilitychange&#039;;
				visibilityState = &#039;webkitVisibilityState&#039;;
			}

			if ( hidden ) {
				if ( document[hidden] ) {
					settings.hasFocus = false;
				}

				$document.on( visibilitychange + &#039;.wp-heartbeat&#039;, function() {
					if ( document[visibilityState] === &#039;hidden&#039; ) {
						blurred();
						window.clearInterval( settings.checkFocusTimer );
					} else {
						focused();
						if ( document.hasFocus ) {
							settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
						}
					}
				});
			}

			// Use document.hasFocus() if available.
			if ( document.hasFocus ) {
				settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
			}

			$(window).on( &#039;pagehide.wp-heartbeat&#039;, function() {
				// Don&#039;t connect anymore.
				suspend();

				// Abort the last request if not completed.
				if ( settings.xhr &amp;&amp; settings.xhr.readyState !== 4 ) {
					settings.xhr.abort();
				}
			});

			$(window).on(
				&#039;pageshow.wp-heartbeat&#039;,
				/**
				 * Handles pageshow event, specifically when page navigation is restored from back/forward cache.
				 *
				 * @param {jQuery.Event} event
				 * @param {PageTransitionEvent} event.originalEvent
				 */
				function ( event ) {
					if ( event.originalEvent.persisted ) {
						/*
						 * When page navigation is stored via bfcache (Back/Forward Cache), consider this the same as
						 * if the user had just switched to the tab since the behavior is similar.
						 */
						focused();
					}
				}
			);

			// Check for user activity every 30 seconds.
			window.setInterval( checkUserActivity, 30000 );

			// Start one tick after DOM ready.
			$( function() {
				settings.lastTick = time();
				scheduleNextTick();
			});
		}

		/**
		 * Returns the current time according to the browser.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {number} Returns the current time.
		 */
		function time() {
			return (new Date()).getTime();
		}

		/**
		 * Checks if the iframe is from the same origin.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {boolean} Returns whether or not the iframe is from the same origin.
		 */
		function isLocalFrame( frame ) {
			var origin, src = frame.src;

			/*
			 * Need to compare strings as WebKit doesn&#039;t throw JS errors when iframes have
			 * different origin. It throws uncatchable exceptions.
			 */
			if ( src &amp;&amp; /^https?:\/\//.test( src ) ) {
				origin = window.location.origin ? window.location.origin : window.location.protocol + &#039;//&#039; + window.location.host;

				if ( src.indexOf( origin ) !== 0 ) {
					return false;
				}
			}

			try {
				if ( frame.contentWindow.document ) {
					return true;
				}
			} catch(e) {}

			return false;
		}

		/**
		 * Checks if the document&#039;s focus has changed.
		 *
		 * @since 4.1.0
		 * @access private
		 *
		 * @return {void}
		 */
		function checkFocus() {
			if ( settings.hasFocus &amp;&amp; ! document.hasFocus() ) {
				blurred();
			} else if ( ! settings.hasFocus &amp;&amp; document.hasFocus() ) {
				focused();
			}
		}

		/**
		 * Sets error state and fires an event on XHR errors or timeout.
		 *
		 * @since 3.8.0
		 * @access private
		 *
		 * @param {string} error  The error type passed from the XHR.
		 * @param {number} status The HTTP status code passed from jqXHR
		 *                        (200, 404, 500, etc.).
		 *
		 * @return {void}
		 */
		function setErrorState( error, status ) {
			var trigger;

			if ( error ) {
				switch ( error ) {
					case &#039;abort&#039;:
						// Do nothing.
						break;
					case &#039;timeout&#039;:
						// No response for 30 seconds.
						trigger = true;
						break;
					case &#039;error&#039;:
						if ( 503 === status &amp;&amp; settings.hasConnected ) {
							trigger = true;
							break;
						}
						/* falls through */
					case &#039;parsererror&#039;:
					case &#039;empty&#039;:
					case &#039;unknown&#039;:
						settings.errorcount++;

						if ( settings.errorcount &gt; 2 &amp;&amp; settings.hasConnected ) {
							trigger = true;
						}

						break;
				}

				if ( trigger &amp;&amp; ! hasConnectionError() ) {
					settings.connectionError = true;
					$document.trigger( &#039;heartbeat-connection-lost&#039;, [error, status] );
					wp.hooks.doAction( &#039;heartbeat.connection-lost&#039;, error, status );
				}
			}
		}

		/**
		 * Clears the error state and fires an event if there is a connection error.
		 *
		 * @since 3.8.0
		 * @access private
		 *
		 * @return {void}
		 */
		function clearErrorState() {
			// Has connected successfully.
			settings.hasConnected = true;

			if ( hasConnectionError() ) {
				settings.errorcount = 0;
				settings.connectionError = false;
				$document.trigger( &#039;heartbeat-connection-restored&#039; );
				wp.hooks.doAction( &#039;heartbeat.connection-restored&#039; );
			}
		}

		/**
		 * Gathers the data and connects to the server.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {void}
		 */
		function connect() {
			var ajaxData, heartbeatData;

			// If the connection to the server is slower than the interval,
			// heartbeat connects as soon as the previous connection&#039;s response is received.
			if ( settings.connecting || settings.suspend ) {
				return;
			}

			settings.lastTick = time();

			heartbeatData = $.extend( {}, settings.queue );
			// Clear the data queue. Anything added after this point will be sent on the next tick.
			settings.queue = {};

			$document.trigger( &#039;heartbeat-send&#039;, [ heartbeatData ] );
			wp.hooks.doAction( &#039;heartbeat.send&#039;, heartbeatData );

			ajaxData = {
				data: heartbeatData,
				interval: settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000,
				_nonce: typeof window.heartbeatSettings === &#039;object&#039; ? window.heartbeatSettings.nonce : &#039;&#039;,
				action: &#039;heartbeat&#039;,
				screen_id: settings.screenId,
				has_focus: settings.hasFocus
			};

			if ( &#039;customize&#039; === settings.screenId  ) {
				ajaxData.wp_customize = &#039;on&#039;;
			}

			settings.connecting = true;
			settings.xhr = $.ajax({
				url: settings.url,
				type: &#039;post&#039;,
				timeout: 30000, // Throw an error if not completed after 30 seconds.
				data: ajaxData,
				dataType: &#039;json&#039;
			}).always( function() {
				settings.connecting = false;
				scheduleNextTick();
			}).done( function( response, textStatus, jqXHR ) {
				var newInterval;

				if ( ! response ) {
					setErrorState( &#039;empty&#039; );
					return;
				}

				clearErrorState();

				if ( response.nonces_expired ) {
					$document.trigger( &#039;heartbeat-nonces-expired&#039; );
					wp.hooks.doAction( &#039;heartbeat.nonces-expired&#039; );
				}

				// Change the interval from PHP.
				if ( response.heartbeat_interval ) {
					newInterval = response.heartbeat_interval;
					delete response.heartbeat_interval;
				}

				// Update the heartbeat nonce if set.
				if ( response.heartbeat_nonce &amp;&amp; typeof window.heartbeatSettings === &#039;object&#039; ) {
					window.heartbeatSettings.nonce = response.heartbeat_nonce;
					delete response.heartbeat_nonce;
				}

				// Update the Rest API nonce if set and wp-api loaded.
				if ( response.rest_nonce &amp;&amp; typeof window.wpApiSettings === &#039;object&#039; ) {
					window.wpApiSettings.nonce = response.rest_nonce;
					// This nonce is required for api-fetch through heartbeat.tick.
					// delete response.rest_nonce;
				}

				$document.trigger( &#039;heartbeat-tick&#039;, [response, textStatus, jqXHR] );
				wp.hooks.doAction( &#039;heartbeat.tick&#039;, response, textStatus, jqXHR );

				// Do this last. Can trigger the next XHR if connection time &gt; 5 seconds and newInterval == &#039;fast&#039;.
				if ( newInterval ) {
					interval( newInterval );
				}
			}).fail( function( jqXHR, textStatus, error ) {
				setErrorState( textStatus || &#039;unknown&#039;, jqXHR.status );
				$document.trigger( &#039;heartbeat-error&#039;, [jqXHR, textStatus, error] );
				wp.hooks.doAction( &#039;heartbeat.error&#039;, jqXHR, textStatus, error );
			});
		}

		/**
		 * Schedules the next connection.
		 *
		 * Fires immediately if the connection time is longer than the interval.
		 *
		 * @since 3.8.0
		 * @access private
		 *
		 * @return {void}
		 */
		function scheduleNextTick() {
			var delta = time() - settings.lastTick,
				interval = settings.mainInterval;

			if ( settings.suspend ) {
				return;
			}

			if ( ! settings.hasFocus ) {
				interval = 120000; // 120 seconds. Post locks expire after 150 seconds.
			} else if ( settings.countdown &gt; 0 &amp;&amp; settings.tempInterval ) {
				interval = settings.tempInterval;
				settings.countdown--;

				if ( settings.countdown &lt; 1 ) {
					settings.tempInterval = 0;
				}
			}

			if ( settings.minimalInterval &amp;&amp; interval &lt; settings.minimalInterval ) {
				interval = settings.minimalInterval;
			}

			window.clearTimeout( settings.beatTimer );

			if ( delta &lt; interval ) {
				settings.beatTimer = window.setTimeout(
					function() {
						connect();
					},
					interval - delta
				);
			} else {
				connect();
			}
		}

		/**
		 * Sets the internal state when the browser window becomes hidden or loses focus.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {void}
		 */
		function blurred() {
			settings.hasFocus = false;
		}

		/**
		 * Sets the internal state when the browser window becomes visible or is in focus.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {void}
		 */
		function focused() {
			settings.userActivity = time();

			// Resume if suspended.
			resume();

			if ( ! settings.hasFocus ) {
				settings.hasFocus = true;
				scheduleNextTick();
			}
		}

		/**
		 * Suspends connecting.
		 */
		function suspend() {
			settings.suspend = true;
		}

		/**
		 * Resumes connecting.
		 */
		function resume() {
			settings.suspend = false;
		}

		/**
		 * Runs when the user becomes active after a period of inactivity.
		 *
		 * @since 3.6.0
		 * @access private
		 *
		 * @return {void}
		 */
		function userIsActive() {
			settings.userActivityEvents = false;
			$document.off( &#039;.wp-heartbeat-active&#039; );

			$(&#039;iframe&#039;).each( function( i, frame ) {
				if ( isLocalFrame( frame ) ) {
					$( frame.contentWindow ).off( &#039;.wp-heartbeat-active&#039; );
				}
			});

			focused();
		}

		/**
		 * Checks for user activity.
		 *
		 * Runs every 30 seconds. Sets &#039;hasFocus = true&#039; if user is active and the window
		 * is in the background. Sets &#039;hasFocus = false&#039; if the user has been inactive
		 * (no mouse or keyboard activity) for 5 minutes even when the window has focus.
		 *
		 * @since 3.8.0
		 * @access private
		 *
		 * @return {void}
		 */
		function checkUserActivity() {
			var lastActive = settings.userActivity ? time() - settings.userActivity : 0;

			// Throttle down when no mouse or keyboard activity for 5 minutes.
			if ( lastActive &gt; 300000 &amp;&amp; settings.hasFocus ) {
				blurred();
			}

			// Suspend after 10 minutes of inactivity when suspending is enabled.
			// Always suspend after 60 minutes of inactivity. This will release the post lock, etc.
			if ( ( settings.suspendEnabled &amp;&amp; lastActive &gt; 600000 ) || lastActive &gt; 3600000 ) {
				suspend();
			}

			if ( ! settings.userActivityEvents ) {
				$document.on( &#039;mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active&#039;, function() {
					userIsActive();
				});

				$(&#039;iframe&#039;).each( function( i, frame ) {
					if ( isLocalFrame( frame ) ) {
						$( frame.contentWindow ).on( &#039;mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active&#039;, function() {
							userIsActive();
						});
					}
				});

				settings.userActivityEvents = true;
			}
		}

		// Public methods.

		/**
		 * Checks whether the window (or any local iframe in it) has focus, or the user
		 * is active.
		 *
		 * @since 3.6.0
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @return {boolean} True if the window or the user is active.
		 */
		function hasFocus() {
			return settings.hasFocus;
		}

		/**
		 * Checks whether there is a connection error.
		 *
		 * @since 3.6.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @return {boolean} True if a connection error was found.
		 */
		function hasConnectionError() {
			return settings.connectionError;
		}

		/**
		 * Connects as soon as possible regardless of &#039;hasFocus&#039; state.
		 *
		 * Will not open two concurrent connections. If a connection is in progress,
		 * will connect again immediately after the current connection completes.
		 *
		 * @since 3.8.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @return {void}
		 */
		function connectNow() {
			settings.lastTick = 0;
			scheduleNextTick();
		}

		/**
		 * Disables suspending.
		 *
		 * Should be used only when Heartbeat is performing critical tasks like
		 * autosave, post-locking, etc. Using this on many screens may overload
		 * the user&#039;s hosting account if several browser windows/tabs are left open
		 * for a long time.
		 *
		 * @since 3.8.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @return {void}
		 */
		function disableSuspend() {
			settings.suspendEnabled = false;
		}

		/**
		 * Gets/Sets the interval.
		 *
		 * When setting to &#039;fast&#039; or 5, the interval is 5 seconds for the next 30 ticks
		 * (for 2 minutes and 30 seconds) by default. In this case the number of &#039;ticks&#039;
		 * can be passed as second argument. If the window doesn&#039;t have focus,
		 * the interval slows down to 2 minutes.
		 *
		 * @since 3.6.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @param {string|number} speed Interval: &#039;fast&#039; or integer between 1 and 3600 (seconds).
		 *                              Fast equals 5.
		 * @param {number}        ticks Tells how many ticks before the interval reverts back.
		 *                              Value must be between 1 and 30. Used with speed = &#039;fast&#039; or 5.
		 *
		 * @return {number} Current interval in seconds.
		 */
		function interval( speed, ticks ) {
			var newInterval,
				oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval;

			if ( speed ) {
				if ( &#039;fast&#039; === speed ) {
					// Special case, see below.
					newInterval = 5000;
				} else if ( &#039;long-polling&#039; === speed ) {
					// Allow long polling (experimental).
					settings.mainInterval = 0;
					return 0;
				} else {
					speed = parseInt( speed, 10 );

					if ( speed &gt;= 1 &amp;&amp; speed &lt;= 3600 ) {
						newInterval = speed * 1000;
					} else {
						newInterval = settings.originalInterval;
					}
				}

				if ( settings.minimalInterval &amp;&amp; newInterval &lt; settings.minimalInterval ) {
					newInterval = settings.minimalInterval;
				}

				// Special case, runs for a number of ticks then reverts to the previous interval.
				if ( 5000 === newInterval ) {
					ticks = parseInt( ticks, 10 ) || 30;
					ticks = ticks &lt; 1 || ticks &gt; 30 ? 30 : ticks;

					settings.countdown = ticks;
					settings.tempInterval = newInterval;
				} else {
					settings.countdown = 0;
					settings.tempInterval = 0;
					settings.mainInterval = newInterval;
				}

				/*
				 * Change the next connection time if new interval has been set.
				 * Will connect immediately if the time since the last connection
				 * is greater than the new interval.
				 */
				if ( newInterval !== oldInterval ) {
					scheduleNextTick();
				}
			}

			return settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000;
		}

		/**
		 * Enqueues data to send with the next XHR.
		 *
		 * As the data is send asynchronously, this function doesn&#039;t return the XHR
		 * response. To see the response, use the custom jQuery event &#039;heartbeat-tick&#039;
		 * on the document, example:
		 *		$(document).on( &#039;heartbeat-tick.myname&#039;, function( event, data, textStatus, jqXHR ) {
		 *			// code
		 *		});
		 * If the same &#039;handle&#039; is used more than once, the data is not overwritten when
		 * the third argument is &#039;true&#039;. Use `wp.heartbeat.isQueued(&#039;handle&#039;)` to see if
		 * any data is already queued for that handle.
		 *
		 * @since 3.6.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @param {string}  handle      Unique handle for the data, used in PHP to
		 *                              receive the data.
		 * @param {*}       data        The data to send.
		 * @param {boolean} noOverwrite Whether to overwrite existing data in the queue.
		 *
		 * @return {boolean} True if the data was queued.
		 */
		function enqueue( handle, data, noOverwrite ) {
			if ( handle ) {
				if ( noOverwrite &amp;&amp; this.isQueued( handle ) ) {
					return false;
				}

				settings.queue[handle] = data;
				return true;
			}
			return false;
		}

		/**
		 * Checks if data with a particular handle is queued.
		 *
		 * @since 3.6.0
		 *
		 * @param {string} handle The handle for the data.
		 *
		 * @return {boolean} True if the data is queued with this handle.
		 */
		function isQueued( handle ) {
			if ( handle ) {
				return settings.queue.hasOwnProperty( handle );
			}
		}

		/**
		 * Removes data with a particular handle from the queue.
		 *
		 * @since 3.7.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @param {string} handle The handle for the data.
		 *
		 * @return {void}
		 */
		function dequeue( handle ) {
			if ( handle ) {
				delete settings.queue[handle];
			}
		}

		/**
		 * Gets data that was enqueued with a particular handle.
		 *
		 * @since 3.7.0
		 *
		 * @memberOf wp.heartbeat.prototype
		 *
		 * @param {string} handle The handle for the data.
		 *
		 * @return {*} The data or undefined.
		 */
		function getQueuedItem( handle ) {
			if ( handle ) {
				return this.isQueued( handle ) ? settings.queue[handle] : undefined;
			}
		}

		initialize();

		// Expose public methods.
		return {
			hasFocus: hasFocus,
			connectNow: connectNow,
			disableSuspend: disableSuspend,
			interval: interval,
			hasConnectionError: hasConnectionError,
			enqueue: enqueue,
			dequeue: dequeue,
			isQueued: isQueued,
			getQueuedItem: getQueuedItem
		};
	};

	/**
	 * Ensure the global `wp` object exists.
	 *
	 * @namespace wp
	 */
	window.wp = window.wp || {};

	/**
	 * Contains the Heartbeat API.
	 *
	 * @namespace wp.heartbeat
	 * @type {Heartbeat}
	 */
	window.wp.heartbeat = new Heartbeat();

}( jQuery, window ));
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