src/third_party/WebKit/LayoutTests/compositing/squashing/invalidations-with-large-negative-margin.html

   1 <!DOCTYPE html>
   2 <div style="height:200px;width:600px;overflow:scroll">
   3   <div style="position:relative">
   4     <div style="height:400px;margin-bottom:-400px;position:relative">
   5       <div id="chip" style="width:50px;height:50px;position:absolute;background:lightblue;margin:0"></div>
   6     </div>
   7   </div>
   8 </div>
   9
  10 <pre id="output" style="display:none"></pre>
  11 <script>
  12 // Test that moving a RenderLayer that is squashed relative to its squashing container repaints correctly.
  13 // In particular, the repaint rect needs to be recorded in the correct position relative to the squashing GraphicsLayer.
  14 if (window.testRunner) {
  15     testRunner.dumpAsText();
  16     testRunner.waitUntilDone();
  17 }
  18
  19 if (window.internals) {
  20     window.internals.settings.setLayerSquashingEnabled(true);
  21     window.internals.startTrackingRepaints(document);
  22 }
  23 var updateFunction = function()
  24 {
  25     document.getElementById('chip').style.left = "400px";
  26
  27     if (window.internals) {
  28         var data = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
  29         window.internals.stopTrackingRepaints(document);
  30         var output = document.getElementById('output');
  31         output.textContent = data;
  32
  33         output.style.display = "block";
  34     }
  35     if (window.testRunner)
  36         testRunner.notifyDone();
  37 }
  38
  39 // Wait two frames before updating the chip's style, so that the document is painted and squashed first.
  40 window.requestAnimationFrame(function() {
  41     window.requestAnimationFrame(updateFunction);
  42 });
  43
  44
  45 </script>