bubble console methods from nested iframes into root window.console

bubbled-console.js

//##console.log bubble for nested iframes
//##by [Kyle Phillips](http://haptic-data.com)
//find each iframe recursively and bubble its logs up to the current window.console
(function( d, w ){
	function bubble( doc, win, msg ){
		Array.prototype.forEach.call(doc.getElementsByTagName('iframe'), function( frame ){
			if( !sameOrigin(frame.src) || !frame.contentWindow || !frame.contentWindow.console ){
				w.console.log('console of iframe ', frame.src, ' is unreachable');
				return;
			}
			msg = [msg,' iframe#', frame.id].join('');
			[ "log", "error", "warn",  "info" ].forEach(function( method ){
				frame.contentWindow.console[method] = function(){
					w.console[method].apply(w.console, [msg, '-> '].concat(Array.prototype.slice.call(arguments,0)) );
				};
			});
			bubble( frame.contentDocument, frame.contentWindow, msg);
		});
	}
	function sameOrigin(url) {
		var host, protocol, srOrigin, origin;
		// url could be relative or scheme relative or absolute
		host = d.location.host; // host + port
		protocol = d.location.protocol;
		srOrigin = '//' + host;
		origin = protocol + srOrigin;
		// Allow absolute or scheme relative URLs to same origin
		return (url == origin || url.slice(0, origin.length + 1) == origin + '/') ||
			(url == srOrigin || url.slice(0, srOrigin.length + 1) == srOrigin + '/') ||
			// or any other URL that isn't scheme relative or absolute i.e relative.
			!(/^(\/\/|http:|https:).*/.test(url));
	}
	bubble( d, w, "" );
}( document, window ));