<!DOCTYPE html> <html> <head> <style> ::-webkit-scrollbar { width: 0px; height: 0px; } .fixed-no-z-index { position: absolute; left: 10px; } .fixed-with-z-index { position: fixed; z-index: 1; left: 10px; } </style> <script> if (window.internals && window.eventSender) { window.internals.settings.setPreferCompositingToLCDTextEnabled(true); window.internals.setPageScaleFactorLimits(0.5, 0.5); window.internals.setPageScaleFactor(0.5); } function test() { if (window.testRunner) testRunner.dumpAsTextWithPixelResults(); var d = document.getElementById('frame').contentDocument.open(); d.write("<div style='position:fixed; z-index: 1; left; 10px;'>TEST</div>"); d.close(); } </script> </head> <body onload="test();" style="width:2000px;height:2000px;"> <div class="fixed-no-z-index">TEST</div><br> <iframe id="frame"></iframe> </body> </html>