| <!DOCTYPE html> <!-- webkit-test-runner [ CSSScrollAnchoringEnabled=false ] --> |
| <html> |
| <head> |
| <style> |
| body { |
| height: 4000px; |
| } |
| |
| .sticky { |
| position: sticky; |
| top: 200px; |
| height: 1000px; |
| } |
| |
| .layer.child { |
| position: relative; |
| margin: 20px; |
| } |
| |
| #layout-trigger { |
| position: absolute; |
| top: 10px; |
| left: 0; |
| width: 100px; |
| height: 100px; |
| background-color: blue; |
| } |
| </style> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../../resources/ui-helper.js"></script> |
| <script> |
| var jsTestIsAsync = true; |
| |
| window.addEventListener('load', async () => { |
| window.onscroll = () => { |
| document.getElementById('layout-trigger').style.left = `${window.scrollY / 4}px`; |
| } |
| |
| await UIHelper.renderingUpdate(); |
| await UIHelper.statelessMouseWheelScrollAt(10, 10, 0, -1); |
| await UIHelper.renderingUpdate(); |
| |
| if (window.internals) |
| window.internals.startTrackingRepaints(); |
| |
| await Promise.all([ |
| UIHelper.waitForEvent(window, 'scroll'), |
| UIHelper.statelessMouseWheelScrollAt(10, 10, 0, -1) |
| ]); |
| |
| const layerTree = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS); |
| repaintCount = (layerTree.match(/\(rect 0\.00 0\.00 769\.00 1000\.00\)/g) || []).length |
| shouldBe('repaintCount', '1'); |
| |
| finishJSTest(); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div id="layout-trigger"></div> |
| <div class="sticky"> |
| <div class="layer child">A</div> |
| <div class="layer child">A</div> |
| <div class="layer child">A</div> |
| </div> |
| <div id="console"></div> |
| </body> |
| </html> |
