third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-repaint-two-level-scrollable.html

   1 <!DOCTYPE html>
   2 <script src="../../resources/run-after-layout-and-paint.js"></script>
   3 <script>
   4 if (window.testRunner)
   5   testRunner.dumpAsText();
   6 onload = function() {
   7   // Expose left part of the inner horizontal scrollbar first.
   8   document.getElementById('outer').scrollTop = 250;
   9   runAfterLayoutAndPaint(function() {
  10     // Expose the forward track and forward button of the inner horizontal scrollbar.
  11     document.getElementById('outer').scrollLeft = 250;
  12   }, true);
  13 };
  14 </script>
  15 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.
  16 <div id="outer" style="position: absolute; top: 100px; left: 50px; width: 200px; height: 200px; overflow: scroll">
  17   <div id="inner" style="width: 400px; height: 400px; overflow: scroll">
  18     <div style="height: 500px; width: 100%; border: 1px solid black">PASS</div>
  19   </div>
  20 </div>