A tool created for developers working with user interfaces
This is still work in progress
Chrome: Right-click on the bookmarks bar and choose "Add Page". Give the bookmarklet a title ("UI Toolbar" would be good) and paste below code into the URL field.
javascript:!function(){if(!document.getElementById("debugscript")){var b=document.createElement("script");b.src="https://youseedk.github.io/uitoolbar/uitoolbar.js",b.id="debugscript",document.head?document.head.appendChild(b):document.getElementsByTagName("head")[0].appendChild(b)}}();
Visit a page, click the bookmarklet.