| OLD | NEW |
|---|
| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 |
| 3 <html> |
| 4 <head> |
| 5 <style> |
| 6 .fixed { |
| 7 position: fixed; |
| 8 z-index: 1; |
| 9 } |
| 10 |
| 11 .absolute { |
| 12 position: absolute; |
| 13 } |
| 14 |
| 15 .unscrollable { |
| 16 overflow-x: hidden; |
| 17 overflow-y: hidden; |
| 18 } |
| 19 |
| 20 .box { |
| 21 top: 100px; |
| 22 left: 10px; |
| 23 width: 100px; |
| 24 height: 100px; |
| 25 } |
| 26 |
| 27 .red { |
| 28 background-color: red; |
| 29 } |
| 30 |
| 31 .lime { |
| 32 background-color: lime; |
| 33 } |
| 34 |
| 35 .composited { |
| 36 -webkit-transform: translatez(0); |
| 37 } |
| 38 </style> |
| 39 |
| 40 <script type="text/javascript"> |
| 41 if (window.internals) |
| 42 window.internals.settings.setAcceleratedCompositingForFixedPositionEnabled
(true); |
| 43 |
| 44 if (window.testRunner) { |
| 45 testRunner.dumpAsText(); |
| 46 |
| 47 window.addEventListener("load", function() { |
| 48 document.getElementById("layertree").innerText = window.internals.layerT
reeAsText(document); |
| 49 }, false); |
| 50 } |
| 51 </script> |
| 52 </head> |
| 53 |
| 54 <body class="unscrollable"> |
| 55 <div style="height: 4000px"> |
| 56 <p>Even though we can opt-out of fixed-position compositing for |
| 57 unscrollable fixed-position containers, we still need to composite |
| 58 fixed-position layers that need compositing for other reasons such as |
| 59 overlap.</p> |
| 60 <pre id="layertree"></pre> |
| 61 </div> |
| 62 |
| 63 <div class="absolute composited red box"></div> |
| 64 |
| 65 <!-- This should be composited because it overlaps a composited layer. --> |
| 66 <div class="fixed lime box"></div> |
| 67 </body> |
| 68 </html> |
| 69 |
| OLD | NEW |
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Chromium Code Reviews
Issue 13828004:
Avoid compositing fixed-position elements if they cannot scroll (Closed)
Base URL: svn://svn.chromium.org/blink/trunk