<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8" /> <title>CSS Transitions Test: transition-property - z-index</title> <link href="http://www.intel.com" rel="author" title="Intel" /> <link href="mailto:shiyoux.tan@intel.com" rel="author" title="Shiyou Tan" /> <link href="http://www.w3.org/TR/css3-transitions/#animatable-css" rel="help" title="7.1. Properties from CSS" /> <meta content="ahem,interact" name="flags" /> <meta content="Test checks that the 'z-index' property is animatable." name="assert" /> <style> div { height: 100px; width: 100px; } #ref { background-color: red; z-index: 1; } #test { background-color: green; position: relative; top: -100px; transition-duration: 2s; transition-property: z-index; transition-timing-function: linear; z-index: -100; } </style> </head><body> <p>Click red square below. Test passes if the color of square changes to green after waiting a moment.</p> <div id="ref"></div> <div id="test"></div> <script> (function() { var test = document.querySelector("#test"); document.addEventListener("click", function(evt) { test.setAttribute("style", "z-index: 100;"); }, false); })(); </script> </body></html>