<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Transitions Test: transition-property - font-weight</title> <link rel="author" title="Intel" href="http://www.intel.com"> <link rel="author" title="Shiyou Tan" href="mailto:shiyoux.tan@intel.com"> <link rel="help" href="https://drafts.csswg.org/web-animations-1/#animation-type"> <link rel="help" href="https://drafts.csswg.org/web-animations-1/#animation-types"> <meta name="assert" content="Test checks that the 'font-weight' property is animatable."> <style> #test { font-weight: 100; transition-duration: 2s; transition-property: font-weight; transition-timing-function: linear; } </style> <body> <p>Click the 'FillerText' below. Test passes if the weight of 'FillerText' increases gradually not immediately until it stops.</p> <div id="test"> FillerTextFillerTextFillerTextFillerText </div> <script> (function() { var test = document.querySelector("#test"); test.addEventListener("click", function(evt) { test.setAttribute("style", "font-weight: 900;"); }, false); })(); </script> </body>