third_party/WebKit/PerformanceTests/Layout/subtree-detaching.html

   1 <!DOCTYPE html>
   2 <html>
   3 <body>
   4 <script src="../resources/runner.js"></script>
   5 <script>
   6 function buildTree()
   7 {
   8     wrapper = document.createElement("div");
   9     for (i = 0; i < 1000; ++i) {
  10         var child = document.createElement("div");
  11         for (j = 0; j < 1000; ++j) {
  12             var grandChild = document.createElement("div");
  13             child.appendChild(grandChild);
  14         }
  15         wrapper.appendChild(child);
  16     }
  17     document.body.appendChild(wrapper);
  18 }
  19
  20 function setup() {
  21     wrapper.style.display = "block";
  22     PerfTestRunner.forceLayoutOrFullFrame();
  23 }
  24
  25 function runTest() {
  26     setup();
  27
  28     var now = PerfTestRunner.now();
  29
  30     wrapper.style.display = "none";
  31     PerfTestRunner.forceLayoutOrFullFrame();
  32
  33     return PerfTestRunner.now() - now;
  34 }
  35
  36 buildTree();
  37
  38 PerfTestRunner.measureTime({run: runTest, description: "This benchmark checks the time spend in detaching an tree." });
  39 </script>
  40 </body>
  41 </html>