ext-xdomain-messaging.js
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ext-xdomain-messaging.js
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			/**
			* Should not be needed for same domain control (just call via child frame),
			* but an API common for cross-domain and same domain use can be found
			* in embedapi.js with a demo at embedapi.html
			*/
			/globals svgEditor, svgCanvas/
			svgEditor.addExtension('xdomain-messaging', function() {'use strict';
			try {
			window.addEventListener('message', function(e) {
			// We accept and post strings for the sake of IE9 support
			if (typeof e.data !== 'string' \|\| e.data.charAt() === '\|') {
			return;
			}
			var cbid, name, args, message, allowedOrigins, data = JSON.parse(e.data);
			if (!data \|\| typeof data !== 'object' \|\| data.namespace !== 'svgCanvas') {
			return;
			}
			// The default is not to allow any origins, including even the same domain or if run on a file:// URL
			// See config-sample.js for an example of how to configure
			allowedOrigins = svgEditor.curConfig.allowedOrigins;
			if (allowedOrigins.indexOf('*') === -1 && allowedOrigins.indexOf(e.origin) === -1) {
			return;
			}
			cbid = data.id;
			name = data.name;
			args = data.args;
			message = {
			namespace: 'svg-edit',
			id: cbid
			};
			try {
			message.result = svgCanvas[name].apply(svgCanvas, args);
			} catch (err) {
			message.error = err.message;
			}
			e.source.postMessage(JSON.stringify(message), '*');
			}, false);
			}
			catch (err) {
			console.log('Error with xdomain message listener: ' + err);
			}
			});