| <!DOCTYPE html> |
| |
| <!-- crbug.com/336676 - layer creation should not accidentally skip requesting |
| the compositor for a frame to be produced. When there were no other |
| repaints or layout/style changes, the simple act of adding a layer was not |
| triggering compositing updates by itself. To recreate this scenario, an |
| out-of-flow canvas element is added to an empty composited layer. The |
| actual container layer does not get added to the tree until it realizes |
| that it receives the canvas content. --> |
| |
| |
| <html> |
| <head> |
| <script src="../resources/text-based-repaint.js"></script> |
| <style> |
| |
| .composited { |
| will-change: transform; |
| } |
| |
| .box { |
| position: absolute; |
| z-index: 1; |
| width: 300px; |
| height: 300px; |
| top: 0px; |
| left: 0px; |
| } |
| |
| canvas { |
| position: absolute; |
| z-index: 1; |
| top: 0px; |
| left: 0px; |
| } |
| |
| </style> |
| |
| <script> |
| if (window.internals) |
| internals.runtimeFlags.accelerated2dCanvasEnabled = true; |
| |
| function repaintTest() { |
| var canvasElement = document.createElement("canvas"); |
| canvasElement.width = 200; |
| canvasElement.height = 200; |
| var context = canvasElement.getContext("2d"); |
| context.fillStyle = "green"; |
| context.fillRect(80, 80, 50, 50); |
| document.getElementById("container").appendChild(canvasElement); |
| } |
| </script> |
| </head> |
| |
| <body onload="runRepaintAndPixelTest()"> |
| <div id="container" class="composited box"></div> |
| </body> |
| |
| </html> |
