| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| .container { |
| position: absolute; |
| top: 100px; |
| overflow: hidden; |
| width: 500px; |
| height: 150px; |
| border: 1px solid black; |
| } |
| |
| .mover { |
| position: absolute; |
| width: 500px; |
| height: 100%; |
| left: 100%; |
| transform: translateX(-100%); |
| background-color: silver; |
| padding: 10px; |
| } |
| |
| .mover.animating { |
| animation: slide 1s linear forwards; |
| } |
| |
| @keyframes slide { |
| 100% { transform: translateX(0) } |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| |
| function dumpLayerTree() |
| { |
| if (!window.internals) |
| return; |
| |
| var out = document.getElementById('out'); |
| out.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_BACKING_STORE_ATTACHED); |
| } |
| |
| function dumpLayersSoon() |
| { |
| requestAnimationFrame(function() { |
| // Trigger layer flush |
| document.querySelector('.container').style.width = '501px'; |
| dumpLayerTree(); |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }); |
| } |
| |
| window.addEventListener('load', () => { |
| let box = document.getElementById('box'); |
| box.addEventListener('animationstart', dumpLayersSoon, false); |
| box.classList.add('animating'); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <pre id="out"></pre> |
| <div class="container"> |
| <div id="box" class="mover"> |
| Some text here to force backing store. |
| </div> |
| </div> |
| </body> |
| </html> |
