| <!DOCTYPE html> |
| <script src="resources/text-based-repaint.js" type="text/javascript"></script> |
| <style> |
| #outer { |
| overflow: scroll; |
| width: 300px; |
| height: 300px; |
| background-color: blue; |
| position: absolute; |
| } |
| #container { |
| position: absolute; |
| top: 0px; |
| left: 50px; |
| width: 600px; |
| height: 600px; |
| background-color: red; |
| transform: translateZ(0); |
| } |
| </style> |
| <body onload="runRepaintAndPixelTest()"> |
| <div id="outer"> |
| <div id="container"><div id="inner"></div></div> |
| </div> |
| |
| <script> |
| function repaintTest() { |
| // This test ensures we properly paint composited descendants of clipped |
| // ancestors in the invalidateTree step. Composited children can be moved |
| // around in respect to their clipping ancestors without needing to be |
| // repainted (and will have their clip applied directly by the CC), so |
| // Blink needs to ignore their ancestor's clip rects to properly paint. |
| // We can't just change the background color, because that gets repainted |
| // in style recalc and doesn't tickle the bug. |
| document.querySelector('#inner').style.border = '300px solid green'; |
| document.querySelector('#outer').scrollLeft = 500; |
| } |
| </script> |
