| <!DOCTYPE html> |
| <script> |
| if (window.internals) |
| internals.runtimeFlags.implicitRootScrollerEnabled = true; |
| </script> |
| <style> |
| ::-webkit-scrollbar { |
| width: 0px; |
| height: 0px; |
| } |
| body { |
| margin: 0; |
| } |
| #scroller { |
| background: yellow; |
| padding: 50px; |
| box-sizing: border-box; |
| width: 100vw; |
| height: 100vh; |
| overflow: auto; |
| } |
| #negative-margin { |
| width: 100vw; |
| height: 100vh; |
| background: green; |
| margin-top: -100vh; |
| } |
| #foreground1 { |
| display: inline-block; |
| width: 2000px; |
| height: 2000px; |
| background: blue; |
| } |
| #foreground2 { |
| display: inline-block; |
| width: 100px; |
| height: 100px; |
| background: magenta; |
| } |
| </style> |
| <!-- The paint order should be: |
| scroller background (invisible) |
| negative-margin background (visible) |
| foreground1 (visible) |
| foreground2 (visible) |
| --> |
| <div id="scroller"> |
| <div id="foreground1"></div> |
| </div> |
| <div id="negative-margin"> |
| <div id="foreground2"></div> |
| </div> |
| |
| <script> |
| window.onload = function() { |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| } |
| requestAnimationFrame(() => { setTimeout(() => { |
| if (!window.internals || scroller != internals.effectiveRootScroller(document)) { |
| document.body.innerHTML = "FAIL: #scroller is expected to be the effective rootScroller"; |
| return; |
| } |
| // This is needed to reproduce the bug without the fix. |
| scroller.style.background = 'red'; |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| })}); |
| }; |
| </script> |