text: ( function( window, document, settings ) {
  	var src, ready, ii, tests;
  
  	/*
  	 * Create a canvas element for testing native browser support
  	 * of emoji.
  	 */
  	var canvas = document.createElement( 'canvas' );
  	var context = canvas.getContext && canvas.getContext( '2d' );
  
  	/**
  	 * Check if two sets of Emoji characters render the same.
  	 *
  	 * @param set1 array Set of Emoji characters.
  	 * @param set2 array Set of Emoji characters.
  	 * @returns {boolean} True if the two sets render the same.
  	 */
  	function emojiSetsRenderIdentically( set1, set2 ) {
  		var stringFromCharCode = String.fromCharCode;
  
  		// Cleanup from previous test.
  		context.clearRect( 0, 0, canvas.width, canvas.height );
  		context.fillText( stringFromCharCode.apply( this, set1 ), 0, 0 );
  		var rendered1 = canvas.toDataURL();
  
  		// Cleanup from previous test.
  		context.clearRect( 0, 0, canvas.width, canvas.height );
  		context.fillText( stringFromCharCode.apply( this, set2 ), 0, 0 );
  		var rendered2 = canvas.toDataURL();
  
  		return rendered1 === rendered2;
  	}
  
  	/**
  	 * Detect if the browser supports rendering emoji or flag emoji. Flag emoji are a single glyph
  	 * made of two characters, so some browsers (notably, Firefox OS X) don't support them.
  	 *
  	 * @since WP-4.2.0
  	 *
  	 * @param type {String} Whether to test for support of "flag" or "emoji".
  	 * @return {Boolean} True if the browser can render emoji, false if it cannot.
  	 */
  	function browserSupportsEmoji( type ) {
  		var isIdentical;
  
  		if ( ! context || ! context.fillText ) {
  			return false;
  		}
  
  		/*
  		 * Chrome on OS X added native emoji rendering in M41. Unfortunately,
  		 * it doesn't work when the font is bolder than 500 weight. So, we
  		 * check for bold rendering support to avoid invisible emoji in Chrome.
  		 */
  		context.textBaseline = 'top';
  		context.font = '600 32px Arial';
  
  		switch ( type ) {
  			case 'flag':
  				/*
  				 * Test for UN flag compatibility. This is the least supported of the letter locale flags,
  				 * so gives us an easy test for full support.
  				 *
  				 * To test for support, we try to render it, and compare the rendering to how it would look if
  				 * the browser doesn't render it correctly ([U] + [N]).
  				 */
  				isIdentical = emojiSetsRenderIdentically(
  					[ 55356, 56826, 55356, 56819 ],
  					[ 55356, 56826, 8203, 55356, 56819 ]
  				);
  
  				if ( isIdentical ) {
  					return false;
  				}
  
  				/*
  				 * Test for English flag compatibility. England is a country in the United Kingdom, it
  				 * does not have a two letter locale code but rather an five letter sub-division code.
  				 *
  				 * To test for support, we try to render it, and compare the rendering to how it would look if
  				 * the browser doesn't render it correctly (black flag emoji + [G] + [B] + [E] + [N] + [G]).
  				 */
  				isIdentical = emojiSetsRenderIdentically(
  					[ 55356, 57332, 56128, 56423, 56128, 56418, 56128, 56421, 56128, 56430, 56128, 56423, 56128, 56447 ],
  					[ 55356, 57332, 8203, 56128, 56423, 8203, 56128, 56418, 8203, 56128, 56421, 8203, 56128, 56430, 8203, 56128, 56423, 8203, 56128, 56447 ]
  				);
  
  				return ! isIdentical;
  			case 'emoji':
  				/*
  				 * She's the hero Emoji deserves, but not the one it needs right now.
  				 *
  				 * To test for support, try to render a new emoji (female superhero),
  				 * then compare it to how it would look if the browser doesn't render it correctly
  				 * (superhero + female sign).
  				 */
  				isIdentical = emojiSetsRenderIdentically(
  					[55358, 56760, 9792, 65039],
  					[55358, 56760, 8203, 9792, 65039]
  				);
  				return ! isIdentical;
  		}
  
  		return false;
  	}
  
  	function addScript( src ) {
  		var script = document.createElement( 'script' );
  
  		script.src = src;
  		script.defer = script.type = 'text/javascript';
  		document.getElementsByTagName( 'head' )[0].appendChild( script );
  	}
  
  	tests = Array( 'flag', 'emoji' );
  
  	settings.supports = {
  		everything: true,
  		everythingExceptFlag: true
  	};
  
  	for( ii = 0; ii < tests.length; ii++ ) {
  		settings.supports[ tests[ ii ] ] = browserSupportsEmoji( tests[ ii ] );
  
  		settings.supports.everything = settings.supports.everything && settings.supports[ tests[ ii ] ];
  
  		if ( 'flag' !== tests[ ii ] ) {
  			settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && settings.supports[ tests[ ii ] ];
  		}
  	}
  
  	settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && ! settings.supports.flag;
  
  	settings.DOMReady = false;
  	settings.readyCallback = function() {
  		settings.DOMReady = true;
  	};
  
  	if ( ! settings.supports.everything ) {
  		ready = function() {
  			settings.readyCallback();
  		};
  
  		if ( document.addEventListener ) {
  			document.addEventListener( 'DOMContentLoaded', ready, false );
  			window.addEventListener( 'load', ready, false );
  		} else {
  			window.attachEvent( 'onload', ready );
  			document.attachEvent( 'onreadystatechange', function() {
  				if ( 'complete' === document.readyState ) {
  					settings.readyCallback();
  				}
  			} );
  		}
  
  		src = settings.source || {};
  
  		if ( src.concatemoji ) {
  			addScript( src.concatemoji );
  		} else if ( src.wpemoji && src.twemoji ) {
  			addScript( src.twemoji );
  			addScript( src.wpemoji );
  		}
  	}
  
  } )( window, document, window._wpemojiSettings );
  