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| 1 <script> |
| 2 if (window.testRunner) |
| 3 window.testRunner.dumpAsText(); |
| 4 |
| 5 function hasOpaqueCompositedScrollingContentsLayer(layer) { |
| 6 if (layer.name == "Scrolling Contents Layer") |
| 7 return layer.contentsOpaque; |
| 8 if (layer.children) { |
| 9 for (var i = 0; i < layer.children.length; i++) { |
| 10 if (hasOpaqueCompositedScrollingContentsLayer(layer.children[i])) |
| 11 return true; |
| 12 } |
| 13 } |
| 14 return false; |
| 15 } |
| 16 |
| 17 onload = function() { |
| 18 if (!window.testRunner || !window.internals) |
| 19 return; |
| 20 |
| 21 var result = ""; |
| 22 result += "Should have opaque composited scrolling contents layer: "; |
| 23 if (hasOpaqueCompositedScrollingContentsLayer(JSON.parse(window.internals.la
yerTreeAsText(document)))) |
| 24 result += "Pass.\n"; |
| 25 else |
| 26 result += "Fail.\n"; |
| 27 window.testRunner.setCustomTextOutput(result); |
| 28 } |
| 29 </script> |
| 30 <style> |
| 31 #scroller { |
| 32 background: white local content-box; |
| 33 border: 10px solid rgba(0, 255, 0, 0.5); |
| 34 overflow: scroll; |
| 35 width: 200px; |
| 36 height: 200px; |
| 37 will-change: transform; |
| 38 } |
| 39 .spacer { |
| 40 height: 300px; |
| 41 } |
| 42 </style> |
| 43 <!-- The scroller's Scrolling Contents Layer should be opaque due to the opaque |
| 44 color background. Even though the background has a content-box clip there |
| 45 is no gap because the scroller has no padding. This means that we will be |
| 46 able to draw text with subpixel anti-aliasing. |
| 47 --> |
| 48 <div id="scroller"><div class="spacer"></div></div> |
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