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| 1 <!DOCTYPE html> |
| 2 <style> |
| 3 body { |
| 4 margin: 0px; |
| 5 } |
| 6 |
| 7 .scroller { |
| 8 overflow: scroll; |
| 9 width: 200px; |
| 10 height: 600px; |
| 11 } |
| 12 |
| 13 .composited { |
| 14 backface-visibility: hidden; |
| 15 isolation: isolate; |
| 16 } |
| 17 |
| 18 .box { |
| 19 background: rgba(0, 255, 0, 0.9); |
| 20 position: absolute; |
| 21 width: 185px; |
| 22 height: 50px; |
| 23 top: 0px; |
| 24 } |
| 25 |
| 26 .indicator { |
| 27 position: absolute; |
| 28 width: 185px; |
| 29 height: 50px; |
| 30 background: red; /* covered up by .box when working */ |
| 31 } |
| 32 |
| 33 .container { |
| 34 width: 100%; |
| 35 height: 1000px; |
| 36 background: grey; |
| 37 } |
| 38 </style> |
| 39 |
| 40 <div id="scroller" class="scroller"> |
| 41 <div class="composited container"> |
| 42 <div class="indicator"></div> |
| 43 <div class="box"></div> |
| 44 </div> |
| 45 </div> |
| 46 |
| 47 <script> |
| 48 if (window.testRunner) |
| 49 testRunner.waitUntilDone() |
| 50 |
| 51 function doTest() { |
| 52 let scroller = document.getElementById('scroller'); |
| 53 window.requestAnimationFrame(function() { |
| 54 scroller.scrollTop = 200; |
| 55 if (window.testRunner) |
| 56 testRunner.notifyDone(); |
| 57 }); |
| 58 } |
| 59 |
| 60 window.addEventListener('load', function() { |
| 61 window.requestAnimationFrame(function() { |
| 62 window.requestAnimationFrame(doTest); |
| 63 }) |
| 64 }); |
| 65 </script> |
| 66 |
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