| <!DOCTYPE html> |
| <script src="../../resources/run-after-layout-and-paint.js"></script> |
| <script> |
| if (window.testRunner) |
| testRunner.dumpAsText(); |
| onload = function() { |
| // Expose left part of the inner horizontal scrollbar first. |
| document.getElementById('outer').scrollTop = 250; |
| runAfterLayoutAndPaint(function() { |
| // Expose the forward track and forward button of the inner horizontal scrollbar. |
| document.getElementById('outer').scrollLeft = 250; |
| }, true); |
| }; |
| </script> |
| Tests invalidation and painting of scrollbar parts of a scroll area contained by another scroll area, when scrolling of the outer scroll area exposes a new port of the inner scrollbar. Passes if no assertion failure. |
| <div id="outer" style="position: absolute; top: 100px; left: 50px; width: 200px; height: 200px; overflow: scroll"> |
| <div id="inner" style="width: 400px; height: 400px; overflow: scroll"> |
| <div style="height: 500px; width: 100%; border: 1px solid black">PASS</div> |
| </div> |
| </div> |
