third_party/WebKit/LayoutTests/fast/dom/gc-2.html

   1 <html>
   2 <head>
   3 <script>
   4 function doit()
   5 {
   6     var B = document.getElementById("span-B");
   7     B.customProperty = "B";
   8     B.parentNode.customProperty = "A";
   9     B.firstChild.customProperty = "C";
  10
  11     document.getElementById("div").innerHTML = "<span>replacement content</span>";
  12
  13     // create lots of objects to force a garbage collection
  14     var i = 0;
  15     var s;
  16     while (i < 5000) {
  17         i = i+1.11;
  18         s = s + " ";
  19     }
  20
  21     var output= document.getElementById("output");
  22
  23     output.innerHTML += B.customProperty + "<BR>";
  24     if (B.parentNode) {
  25         output.innerHTML += B.parentNode.customProperty + "<BR>";
  26     }
  27     if (B.firstChild) {
  28         output.innerHTML += B.firstChild.customProperty + "<BR>";
  29     }
  30 }
  31
  32 if (window.testRunner) {
  33     testRunner.dumpAsText();
  34 }
  35
  36 </script>
  37 </head>
  38
  39 <body onload="doit()">
  40 <div style="border: 1px solid red">
  41 <p>
  42 This test verifies that JavaScript wrappers for DOM nodes are
  43 protected against garbage collection for node trees that are outside
  44 the document, so long as there's a reference to at least one node in
  45 the tree.
  46 </p>
  47 <p>
  48 The output should be the following pieces of text on lines by themselves: "replacement content", "B", "A", "C".
  49 </p>
  50 </div>
  51 <div id="div">
  52 <span id="span-A"><span id="span-B"><span id="span-C">original span</span></span></span>
  53 </div>
  54 <div id="output">
  55 </div>
  56 </body>
  57 </html>