third_party/WebKit/PerformanceTests/DOM/TraverseChildNodes.html

   1 <!DOCTYPE html>
   2 <html>
   3 <body>
   4 <script src="../resources/runner.js"></script>
   5 <script>
   6 var spec = PerfTestRunner.loadFile("../Parser/resources/html5.html");
   7 var iframe;
   8
   9 PerfTestRunner.measureTime({
  10     description: "Measures performance of traversing through a large HTML document using elem.childNodes.",
  11     setup: function () {
  12         if (iframe)
  13             document.body.removeChild(iframe);
  14         iframe = document.createElement("iframe");
  15         iframe.style.display = "none";  // Prevent creation of the rendering tree, so we only test HTML parsing.
  16         iframe.sandbox = '';  // Prevent external script loads which could cause write() to return before completing the parse.
  17         document.body.appendChild(iframe);
  18         iframe.contentDocument.open();
  19         iframe.contentDocument.write(spec);
  20         iframe.contentDocument.close();
  21     },
  22     run: function() {
  23         var elements = iframe.contentDocument.getElementsByTagName('*');
  24         for (var i = 0; i < elements.length; i++) {
  25             for (var j = 0; j < elements[i].childNodes.length; j++)
  26                 elements[i].childNodes[j];
  27         }
  28     },
  29     done: function () { document.body.removeChild(iframe); }});
  30
  31 </script>
  32 </body>
  33 </html>