| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| #out { |
| position: absolute; |
| } |
| |
| .fixed { |
| position: fixed; |
| top: 0px; |
| bottom:0px; |
| overflow-x: scroll; |
| } |
| .scrolled { |
| column-width: 200px; |
| column-fill: auto; |
| height: 200px; |
| width: 600px; |
| } |
| .filler { |
| width: 200px; |
| height: 200px; |
| background-color:blue; |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| |
| window.onload = function() { |
| if (!window.testRunner) |
| return; |
| |
| requestAnimationFrame(() => { |
| |
| let scroller = document.getElementById('fixed'); |
| scroller.scrollTo(400, 0); |
| |
| let uiScript = `(function() { |
| uiController.doAfterNextStablePresentationUpdate(function() { |
| uiController.uiScriptComplete(); |
| }); |
| })()` |
| |
| testRunner.runUIScript(uiScript, () => { |
| let afterLayers = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_BACKING_STORE_ATTACHED); |
| let out = document.getElementById('out'); |
| out.textContent = `${afterLayers}` |
| testRunner.notifyDone(); |
| }); |
| }); |
| }; |
| </script> |
| </head> |
| <body> |
| <pre id="out"></pre> |
| |
| <div id="fixed" class="fixed"> |
| <div class="scrolled"> |
| <div class="filler"></div> |
| <div class="filler"></div> |
| <div class="filler"></div> |
| <div class="filler"></div> |
| <div class="filler"></div> |
| </div> |
| </div> |
| </body> |
| </html> |
