<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!doctype html> <html> <head> <meta charset="utf-8"/> <title>Performance tool + garbage collection test page</title> </head> <body> <script type="text/javascript"> "use strict"; var x = 1; /* global test */ window.test = function() { SpecialPowers.Cu.forceGC(); document.body.style.borderTop = x + "px solid red"; x = 1 ^ x; // flush pending reflows document.body.innerHeight; // Prevent this script from being garbage collected. setTimeout(window.test, 100); }; test(); </script> </body> </html>