| <!DOCTYPE html> |
| |
| <html> |
| <head> |
| <style> |
| .fixed { |
| position: fixed; |
| width: 10px; |
| height: 10px; |
| background-color: silver; |
| } |
| </style> |
| |
| <script type="text/javascript"> |
| if (window.internals) |
| window.internals.settings.setAcceleratedCompositingForFixedPositionEnabled(true); |
| |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| |
| window.addEventListener("load", function() { |
| document.getElementById("layertree").innerText = window.internals.layerTreeAsText(document); |
| }, false); |
| } |
| </script> |
| </head> |
| |
| <body> |
| <div style="height: 1000px"> |
| <pre id="layertree"></pre> |
| </div> |
| |
| <!-- Neither of the following elements gets its own layer. --> |
| <div class="fixed" style="z-index: -1"></div> |
| <div class="fixed" style="z-index: -1; top: -100px"></div> |
| <div class="fixed" style="z-index: -1; top: 0px; left: 1000px"></div> |
| |
| <!-- This element gets its own layer because it intersects with the viewport. --> |
| <div class="fixed" style="z-index: -1; top: 0px; left: 0px"></div> |
| </body> |
| </html> |
| |
