| <!DOCTYPE html> |
| <html> |
| <head> |
| <style type="text/css"> |
| .box { |
| position: relative; |
| display: inline-block; |
| margin: 30px; |
| width: 200px; |
| height: 200px; |
| will-change: transform; |
| } |
| |
| .main { |
| border: 40px solid black; |
| box-shadow: black 0 0 20px; /* Makes compositing layer larger */ |
| background-color: red; |
| } |
| |
| .child { |
| position: absolute; |
| width: 150px; |
| height: 150px; |
| padding: 20px; |
| transform: translateZ(1px); |
| } |
| |
| .negative { |
| z-index: -1; |
| top: 0; |
| left: 0; |
| height: 10px; |
| width: 10px; |
| } |
| |
| img { |
| background-color: green; |
| height: 200px; |
| width: 200px; |
| } |
| |
| .embiggener { |
| position: absolute; |
| height: 10px; |
| width: 10px; |
| top: -50px; |
| left: -50px; |
| background-color: blue; |
| } |
| |
| #layer-tree { |
| opacity: 0; /* hide from pixel test */ |
| height: 10px; /* avoid scrollbars */ |
| overflow: hidden; |
| } |
| |
| </style> |
| <script type="text/javascript" charset="utf-8"> |
| if (window.testRunner) |
| testRunner.dumpAsTextWithPixelResults(); |
| |
| function dumpLayerTree() |
| { |
| if (window.testRunner) |
| document.getElementById('layer-tree').innerText = internals.layerTreeAsText(document); |
| } |
| |
| window.addEventListener('load', dumpLayerTree, false); |
| </script> |
| </head> |
| <body> |
| |
| <!-- Both boxes should look the same. You should see no red. --> |
| <div class="main box"> |
| <img> |
| <div class="negative child"></div> |
| </div> |
| |
| <div class="main box" style="overflow: hidden;"> |
| <img> |
| <div class="negative child"></div> |
| </div> |
| |
| <pre id="layer-tree"></pre> |
| </body> |
| </html> |
