src/third_party/WebKit/LayoutTests/compositing/squashing/squashing-sparsity-heuristic.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <style>
   5 div {
   6   position: absolute;
   7   z-index: 1;
   8   width: 10px;
   9   height: 10px;
  10 }
  11
  12 .composited {
  13   -webkit-transform: translatez(0);
  14   top: 60px;
  15   left: 60px;
  16   width: 400px;
  17   height: 400px;
  18   background-color: gray;
  19 }
  20
  21 .overlap1 {
  22   top: 140px;
  23   left: 140px;
  24   background-color: blue;
  25 }
  26
  27 .overlap2 {
  28   top: 220px;
  29   left: 220px;
  30   background-color: lime;
  31 }
  32 </style>
  33 <script>
  34     if (window.testRunner)
  35         testRunner.dumpAsText();
  36
  37     if (window.internals)
  38         internals.settings.setLayerSquashingEnabled(true);
  39
  40     function dump() {
  41         if (!window.internals)
  42             return;
  43         var layers = document.createElement('pre');
  44         layers.innerHTML = window.internals.layerTreeAsText(document);
  45         document.body.appendChild(layers);
  46     }
  47
  48     window.onload = dump;
  49 </script>
  50 </head>
  51
  52 <body>
  53   <!--
  54   If this test is working correctly, then the following two layers should not
  55   squash together (as they would create a layer that's too sparse).
  56   -->
  57   <div class="composited"></div>
  58   <div id="A" class="overlap1"></div>
  59   <div id="B" class="overlap2"></div>
  60 </body>
  61 </html>