| <!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] --><html> |
| <html> |
| <head> |
| <style> |
| #scroller { |
| width: 400px; |
| height: 400px; |
| margin: 20px; |
| overflow: scroll; |
| will-change: z-index; |
| border: 1px solid black; |
| } |
| .contents { |
| height: 300%; |
| } |
| |
| .rating { |
| position: relative; |
| background-color: green; |
| padding: 10px; |
| } |
| |
| .wrapper { |
| left: 100px; |
| top: 100px; |
| background-color: rgba(128, 128, 128, 0.2) |
| } |
| |
| .behind { |
| position: absolute; |
| top: 160px; |
| width: 50px; |
| height: 50px; |
| background-color: silver; |
| } |
| |
| .composited { |
| transform: translateZ(0); |
| } |
| |
| .filler { |
| height: 200px; |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| window.addEventListener('load', () => { |
| setTimeout(() => { |
| window.internals.startTrackingRepaints(); |
| document.getElementById('scroller').scrollTop = 80; |
| document.getElementById('layers').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS); |
| testRunner.notifyDone(); |
| }, 50); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div id="scroller"> |
| <div class="composited behind"></div> |
| <div class="contents"> |
| <div class="filler"></div> |
| <div class="rating"> </div> |
| <div class="filler"></div> |
| </div> |
| </div> |
| <pre id="layers"></pre> |
| </body> |
| </html> |
