Pretty CSS Hack to debug layouts

2019-09-17

  1. Create a new bookmark
  2. Add the following code to the bookmark URL:
    javascript: (function() {
	var elements = document.body.getElementsByTagName('*');
	var items = [];
	for (var i = 0; i < elements.length; i++) {
		if (elements[i].innerHTML.indexOf('* { background:#000!important;color:#0f0!important;outline:solid #f00 1px!important; background-color: rgba(255,0,0,.2) !important; }') != -1) {
			items.push(elements[i]);
		}
	}
	if (items.length > 0) {
		for (var i = 0; i < items.length; i++) {
			items[i].innerHTML = '';
		}
	} else {
		document.body.innerHTML +=
			'<style>* { background:#000!important;color:#0f0!important;outline:solid #f00 1px!important; background-color: rgba(255,0,0,.2) !important; }\
            * * { background-color: rgba(0,255,0,.2) !important; }\
            * * * { background-color: rgba(0,0,255,.2) !important; }\
            * * * * { background-color: rgba(255,0,255,.2) !important; }\
            * * * * * { background-color: rgba(0,255,255,.2) !important; }\
            * * * * * * { background-color: rgba(255,255,0,.2) !important; }\
            * * * * * * * { background-color: rgba(255,0,0,.2) !important; }\
            * * * * * * * * { background-color: rgba(0,255,0,.2) !important; }\
            * * * * * * * * * { background-color: rgba(0,0,255,.2) !important; }</style>';
	}
})();

To use it, just navigate to a website and click on the bookmark you defined.

The image below shows this website with the bookmark activated.

Screenshot of Cybertec Layout

You can use it on any page.

Ain't that cool? 😀

P.S.: Tested on Chrome and Firefox.

Check the official post and this Gist for more information.


Loading comments...