I used Inspect in Chrome on the hamburger icon (what I used to call a menu icon until I noticed people call it a hamburger icon). It seems to be a type of SVG contraption.<p>I didn't even know you could do all of this in HTML now:<p>http://www.w3schools.com/svg/svg_path.asp
Now that I think about it more, why create all that complex syntax when you could use a client side application like InkScape to create a hamburger icon then just reference it in HTML simply which I thought was how HTML was supposed to work, simple document viewing.<p>I ask because my wife has complained that some web pages now cause her (aging laptop) to overheat and stop working.