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   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
  33 .overlap3 {
  34   top: 300px;
  35   left: 220px;
  36   background-color: green;
  37 }
  38
  39 .overlap4 {
  40   top: 300px;
  41   left: 235px;
  42   background-color: yellow;
  43 }
  44 </style>
  45 <script>
  46     if (window.testRunner)
  47         testRunner.dumpAsText();
  48
  49     function dump() {
  50         if (!window.internals)
  51             return;
  52         var layers = document.createElement('pre');
  53         layers.innerHTML = window.internals.layerTreeAsText(document);
  54         document.body.appendChild(layers);
  55     }
  56
  57     window.onload = dump;
  58 </script>
  59 </head>
  60
  61 <body>
  62   <!--
  63   If this test is working correctly, then the first two layers should not
  64   squash together (as they would create a layer that's too sparse), but the
  65   third and fourth layers should squash together.
  66   -->
  67   <div class="composited"></div>
  68   <div id="A" class="overlap1"></div>
  69   <div id="B" class="overlap2"></div>
  70   <div id="C" class="overlap3"></div>
  71   <div id="D" class="overlap4"></div>
  72 </body>
  73 </html>