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| (Empty) |
| 1 <!DOCTYPE> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Creating composited layers for fixed position elements</title> | |
| 5 | |
| 6 <style type="text/css" media="screen"> | |
| 7 #tall { | |
| 8 height: 100px; | |
| 9 } | |
| 10 | |
| 11 #fixed { | |
| 12 width: 300px; | |
| 13 height: 100px; | |
| 14 position: fixed; | |
| 15 top: 30px; | |
| 16 right: 5px; | |
| 17 background-color: green; | |
| 18 } | |
| 19 </style> | |
| 20 <script type="text/javascript" charset="utf-8"> | |
| 21 if (window.internals) | |
| 22 window.internals.settings.setAcceleratedCompositingForFixedPositionEnabled
(true); | |
| 23 | |
| 24 function doTest() | |
| 25 { | |
| 26 var layerTreeOutput = ''; | |
| 27 | |
| 28 // If the fixed position element doesn't have its own stacking context the
n | |
| 29 // it cannot get a composited layer. | |
| 30 if (window.testRunner) | |
| 31 layerTreeOutput += 'Before (should be empty): \n' + window.internals.lay
erTreeAsText(document) + '\n'; | |
| 32 | |
| 33 // Adding a z-index to the fixed position element will give it a stacking
context | |
| 34 // and allow it to be composited. | |
| 35 document.getElementById('fixed').style.zIndex = '1'; | |
| 36 | |
| 37 if (window.testRunner) { | |
| 38 layerTreeOutput += 'After (should not be empty): \n' + window.internals.
layerTreeAsText(document); | |
| 39 document.getElementById('layertree').innerText = layerTreeOutput; | |
| 40 testRunner.dumpAsText(); | |
| 41 } | |
| 42 | |
| 43 // Adding a transform to the container will turn off compositing. | |
| 44 document.getElementById('container').style.webkitTransform = 'translateX(0
)'; | |
| 45 if (window.testRunner) { | |
| 46 layerTreeOutput += 'After (should be empty): \n' + window.internals.laye
rTreeAsText(document); | |
| 47 document.getElementById('layertree').innerText = layerTreeOutput; | |
| 48 testRunner.dumpAsText(); | |
| 49 } | |
| 50 | |
| 51 } | |
| 52 | |
| 53 window.addEventListener("load", doTest, false); | |
| 54 | |
| 55 </script> | |
| 56 </head> | |
| 57 | |
| 58 <!-- Fixed position elements may skip compositing without a scrollable | |
| 59 ancestor. To make sure this test covers the intended scenario, we force the | |
| 60 body element to be tall, so that the FrameView is scrolling. --> | |
| 61 <body style="height: 4000px;"> | |
| 62 <!-- Fixed position element should get its own layer --> | |
| 63 <pre id="layertree"></pre> | |
| 64 <div id="tall"></div> | |
| 65 <div id="container"> | |
| 66 <div id="fixed"></div> | |
| 67 </div> | |
| 68 </body> | |
| 69 </html> | |
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Chromium Code Reviews
Issue 206463009:
Rip out Settings::fixedPositionCreatesStackingContext (Closed)
Base URL: svn://svn.chromium.org/blink/trunk