<!DOCTYPE html> <html> <head> <style> html { overflow: hidden; } div { height: 100px; width: 100px; } .fixed { position: fixed; } .green { background-color: green; } .red { background-color: red; } .composited { transform: translateZ(0); } </style> <script type="text/javascript"> if (window.testRunner) testRunner.dumpAsTextWithPixelResults(); function moveFixedDiv() { document.getElementById('fixedDiv').style.top = '200px'; } window.addEventListener('load', moveFixedDiv, false); </script> </head> <body style="height:2000px;"> <!-- You should see 1 green rectangle in the output and no red. --> <div style="top: 200px; left: 100px;" class="fixed red"></div> <div id="fixedDiv" style="top: 500px; left:100px;" class="fixed green composited"></div></div> </body> </html>