HTML Inspector as a bookmarklet.

html-inspector.js

(function(w) {
	if (typeof w.HTMLInspector !== "undefined") {
		w.HTMLInspector.inspect();
	} else {
		var el = document.createElement('script');
		el.setAttribute('src', 'https://rawgit.com/philipwalton/html-inspector/master/html-inspector.js');
		el.addEventListener('load', function() {
			w.HTMLInspector.inspect();
		});
		document.head.appendChild(el);
	}
})(window)

html-inspector.min.js

(function(e){if(typeof e.HTMLInspector!=="undefined"){e.HTMLInspector.inspect()}else{var t=document.createElement("script");t.setAttribute("src","https://rawgit.com/philipwalton/html-inspector/master/html-inspector.js");t.addEventListener("load",function(){e.HTMLInspector.inspect()});document.head.appendChild(t)}})(window)