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Edit File: loadCSS.js

// phpcs:disable
/*! loadCSS. [c]2017 Filament Group, Inc. MIT License */
(function(w){
	"use strict";
	/* exported loadCSS */
	var loadCSS = function( href, before, media, attributes ){
		// Arguments explained:
		// `href` [REQUIRED] is the URL for your CSS file.
		// `before` [OPTIONAL] is the element the script should use as a reference for injecting our stylesheet <link> before
		// By default, loadCSS attempts to inject the link after the last stylesheet or script in the DOM. However, you might desire a more specific location in your document.
		// `media` [OPTIONAL] is the media type or query of the stylesheet. By default it will be 'all'
		// `attributes` [OPTIONAL] is the Object of attribute name/attribute value pairs to set on the stylesheet's DOM Element.
		var doc = w.document;
		var ss = doc.createElement( "link" );
		var ref;
		if( before ){
			ref = before;
		}
		else {
			var refs = ( doc.body || doc.getElementsByTagName( "head" )[ 0 ] ).childNodes;
			ref = refs[ refs.length - 1];
		}

// wait until body is defined before injecting link. This ensures a non-blocking load in IE11.
		function ready( cb ){
			if( doc.body ){
				return cb();
			}
			setTimeout(function(){
				ready( cb );
			});
		}
		// Inject link
			// Note: the ternary preserves the existing behavior of "before" argument, but we could choose to change the argument to "after" in a later release and standardize on ref.nextSibling for all refs
			// Note: `insertBefore` is used instead of `appendChild`, for safety re: http://www.paulirish.com/2011/surefire-dom-element-insertion/
		ready( function(){
			ref.parentNode.insertBefore( ss, ( before ? ref : ref.nextSibling ) );
		});
		// A method (exposed on return object for external use) that mimics onload by polling document.styleSheets until it includes the new sheet.
		var onloadcssdefined = function( cb ){
			var resolvedHref = ss.href;
			var i = sheets.length;
			while( i-- ){
				if( sheets[ i ].href === resolvedHref ){
					return cb();
				}
			}
			setTimeout(function() {
				onloadcssdefined( cb );
			});
		};

function loadCB(){
			if( ss.addEventListener ){
				ss.removeEventListener( "load", loadCB );
			}
			ss.media = media || "all";
		}

// once loaded, set link's media back to `all` so that the stylesheet applies once it loads
		if( ss.addEventListener ){
			ss.addEventListener( "load", loadCB);
		}
		ss.onloadcssdefined = onloadcssdefined;
		onloadcssdefined( loadCB );
		return ss;
	};
	// commonjs
	if( typeof exports !== "undefined" ){
		exports.loadCSS = loadCSS;
	}
	else {
		w.loadCSS = loadCSS;
	}
}( typeof global !== "undefined" ? global : this ));