The Heads-Up Grid is an overlay grid for in-browser website development, built with HTML + CSS + JavaScript. Paste Some Code If you haven’t already defined a grid, use The Gridulator. Then download The Heads-Up Grid files and paste the following code into the <head> element of your webpage: <link href="headsupgrid/hugrid.css" type="text/css" rel="stylesheet" /> <script src="headsupgrid/jquery-1.6.