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| 1 <!DOCTYPE html> |
| 2 <html> |
| 3 <head> |
| 4 <style> |
| 5 #container { |
| 6 width: 300px; |
| 7 height: 300px; |
| 8 border: 3px solid black; |
| 9 overflow: scroll; |
| 10 } |
| 11 |
| 12 .card { |
| 13 width: 100px; |
| 14 height: 100px; |
| 15 margin: 5px; |
| 16 } |
| 17 |
| 18 .fixed { |
| 19 position: fixed; |
| 20 background: blue; |
| 21 z-index: 1; |
| 22 left: 80px; |
| 23 top: 80px; |
| 24 } |
| 25 |
| 26 .scrolled { |
| 27 position: relative; |
| 28 background: green; |
| 29 } |
| 30 </style> |
| 31 <script> |
| 32 if (window.testRunner) |
| 33 testRunner.dumpAsTextWithPixelResults(); |
| 34 |
| 35 if (window.internals) { |
| 36 window.internals.settings.setAcceleratedCompositingForFixedPositionEna
bled(true); |
| 37 window.internals.settings.setAcceleratedCompositingForOverflowScrollEn
abled(true); |
| 38 window.internals.settings.setCompositorDrivenAcceleratedScrollingEnabl
ed(true); |
| 39 window.internals.settings.setLayerSquashingEnabled(true); |
| 40 } |
| 41 |
| 42 function doTest() { |
| 43 var container = document.getElementById("container"); |
| 44 container.scrollTop = container.scrollHeight; |
| 45 |
| 46 // FIXME: this is a hack to work around repainting issues with squashing
. |
| 47 // See http://crbug.com/351790 |
| 48 var scrolledCards = document.getElementsByClassName('scrolled'); |
| 49 for (var i = 0; i < scrolledCards.length; i++) { |
| 50 scrolledCards[i].style.backgroundColor = '#ccc'; |
| 51 } |
| 52 window.internals.forceCompositingUpdate(document); |
| 53 for (var i = 0; i < scrolledCards.length; i++) { |
| 54 scrolledCards[i].style.backgroundColor = 'green'; |
| 55 } |
| 56 } |
| 57 |
| 58 window.onload = doTest; |
| 59 </script> |
| 60 </head> |
| 61 <body> |
| 62 <div id="container"> |
| 63 <div class="fixed card"></div> |
| 64 <div class="scrolled card"></div> |
| 65 <div class="scrolled card"></div> |
| 66 <div class="scrolled card"></div> |
| 67 <div class="scrolled card"></div> |
| 68 <div class="scrolled card"></div> |
| 69 <div class="scrolled card"></div> |
| 70 <div class="scrolled card"></div> |
| 71 <div class="scrolled card"></div> |
| 72 <div class="scrolled card"></div> |
| 73 <div class="scrolled card"></div> |
| 74 <div class="scrolled card"></div> |
| 75 <div class="scrolled card"></div> |
| 76 </div> |
| 77 </body> |
| 78 </html> |
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