| <!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] --> |
| <html> |
| <head> |
| <style> |
| #scroller { |
| width: 300px; |
| height: 300px; |
| overflow: scroll; |
| border: 1px solid black; |
| } |
| |
| .filler { |
| width: 30px; |
| height: 150px; |
| margin: 10px; |
| background-color: silver; |
| } |
| |
| .fixed-background { |
| position: relative; |
| margin: 10px; |
| height: 200px; |
| background-image: linear-gradient(lightblue, palegreen); |
| background-attachment: fixed; |
| background-size: 1px 300px; |
| border: 1px solid blue; |
| box-sizing: border-box; |
| } |
| |
| .fixed-child-background { |
| position: relative; |
| height: 200px; |
| padding: 10px; |
| background-size: 1px 300px; |
| border: 1px solid blue; |
| box-sizing: border-box; |
| } |
| |
| .fixed-child-background > div { |
| height: 100%; |
| background-image: linear-gradient(lightblue, palegreen); |
| background-attachment: fixed; |
| background-size: 1px 300px; |
| } |
| |
| .composited { |
| transform: translateZ(0); |
| } |
| |
| /* Hide the scrollbars to remove scrollbar repaints. */ |
| ::-webkit-scrollbar { |
| display: none; |
| } |
| </style> |
| <script src="../../resources/js-test-pre.js"></script> |
| <script> |
| jsTestIsAsync = true; |
| description("Test that a scroll of an overflow scrolling element, with a composoited `background-attachment:fixed` child, repaints"); |
| |
| function startTrackingRepaints() |
| { |
| window.internals.startTrackingRepaints(); |
| document.getElementById('scroller').scrollTop = 800; |
| |
| logRepaints(); |
| } |
| |
| function logRepaints() |
| { |
| layerTreeAsText = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS); |
| window.internals.stopTrackingRepaints(); |
| shouldBeTrue("layerTreeAsText.indexOf('(rect 0.00 0.00 280.00 200.00)') > -1"); |
| shouldBeTrue("layerTreeAsText.indexOf('(rect 11.00 11.00 278.00 178.00)') > -1"); |
| |
| finishJSTest(); |
| } |
| |
| window.addEventListener('load', () => { |
| if (!window.testRunner || !window.internals) |
| return; |
| |
| setTimeout(startTrackingRepaints, 0); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div id="scroller"> |
| <div class="composited filler"></div> |
| <div class="fixed-background"></div> |
| <div class="fixed-child-background"><div></div></div> |
| <div class="filler"></div> |
| </div> |
| |
| <script src="../../resources/js-test-post.js"></script> |
| </html> |
