| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| body { |
| height: 2000px; |
| } |
| |
| .box { |
| position: absolute; |
| left: 20px; |
| top: 20px; |
| width: 100px; |
| height: 100px; |
| background-color: silver; |
| transition: transform 2s; |
| transform: rotate3d(0, 0, 1, 0deg) |
| } |
| |
| body.changed .box { |
| transform: rotate3d(0, 0, 1, -180deg); |
| } |
| |
| .invisible { |
| top: 1500px; |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| window.addEventListener('load', () => { |
| let box = document.querySelector('.box'); |
| box.addEventListener('transitionstart', () => { |
| requestAnimationFrame(() => { |
| var out = document.getElementById('layers'); |
| out.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_BACKING_STORE_ATTACHED); |
| testRunner.notifyDone(); |
| }); |
| }, false); |
| |
| requestAnimationFrame(() => { |
| document.body.classList.add('changed'); |
| }); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <p>The second box should not have attached backing store.</p> |
| <pre id="layers"></pre> |
| <div class="box">visible box</div> |
| <div class="invisible box">hidden box</div> |
| </body> |
| </html> |
