third_party/WebKit/LayoutTests/paint/invalidation/spv2/fixed-scroll-in-empty-root-layer.html

   1 <!-- Based on compositing/overflow/fixed-scroll-in-empty-root-layer.html -->
   2 <!DOCTYPE html>
   3 <script src="resources/paint-invalidation-test.js"></script>
   4 <script>
   5 window.expectedPaintInvalidationObjects = [
   6     "LayoutBlockFlow (positioned) DIV",
   7     "LayoutBlockFlow (positioned) DIV",
   8 ];
   9 function paintInvalidationTest() {
  10   window.scrollBy(0, 200);
  11 }
  12 onload = runPaintInvalidationTest;
  13 </script>
  14 <body style="height: 2000px">
  15   Tests invalidation of fixed element when scrolled in a page with empty root layer. Passes if there is no red.
  16   <div style="
  17     position: fixed;
  18     top: 50px;
  19     left: 0;
  20     width: 100px;
  21     height: 100px;
  22     background: green">
  23   </div>
  24   <!-- This div makes all of the contents of the page be in sublayers of the root layer, so root layer is empty. -->
  25   <div style="
  26     position: absolute;
  27     z-index: -1;
  28     backface-visibility: hidden;
  29     top: 250px;
  30     left: 0;
  31     background-color: red;
  32     width: 100px;
  33     height: 100px">
  34   </div>
  35 </body>