LayoutTests/fast/dom/gc-6.html - WebKit - Git at Google

 <head>
 <script>

 function frameLoaded()
 {
     // create lots of objects to force a garbage collection
     var i = 0;
     var s;
     while (i < 5000) {
         i = i+1.11;
         s = s + " ";
     }

     var output= document.getElementById("output");

     output.innerHTML += spanB.customProperty + "<BR>";
     output.innerHTML += spanB + "<BR>";
     output.innerHTML += spanB.parentNode + "<BR>";
     output.innerHTML += spanB.ownerDocument + "<BR>";

     if (window.testRunner)
         testRunner.notifyDone();
 }

 function doit()
 {
     var frame = document.getElementById("frame");
     spanB = frame.contentDocument.getElementById("span-B");
     spanB.customProperty = "B";
     frame.onload = frameLoaded;
     frame.src = "about:blank";
 }

 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }

 </script>
 </head>

 <body onload="doit()">
 <div style="border: 1px solid red">
 <p>
 This test verifies that DOM documents are protected against garbage
 collection but without necessarily keeping all their children alive,
 so long as any node in the document is reachable.
 </p>
 <p>
 The output should be the following pieces of text on lines by
 themselves: "B", "[object HTMLElement]", "null", "[object HTMLDocument]".
 </p>
 </div>

 <div id="output">
 </div>

 <iframe id="frame" src='data:text/html,<div id="div"><span id="span-A"><span id="span-B"><span id="span-C">original span</span></span></span></div>'>
 </body>
	<head>
	<script>

	function frameLoaded()
	{
	// create lots of objects to force a garbage collection
	var i = 0;
	var s;
	while (i < 5000) {
	i = i+1.11;
	s = s + " ";
	}

	var output= document.getElementById("output");

	output.innerHTML += spanB.customProperty + "<BR>";
	output.innerHTML += spanB + "<BR>";
	output.innerHTML += spanB.parentNode + "<BR>";
	output.innerHTML += spanB.ownerDocument + "<BR>";

	if (window.testRunner)
	testRunner.notifyDone();
	}

	function doit()
	{
	var frame = document.getElementById("frame");
	spanB = frame.contentDocument.getElementById("span-B");
	spanB.customProperty = "B";
	frame.onload = frameLoaded;
	frame.src = "about:blank";
	}

	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	</script>
	</head>

	<body onload="doit()">
	<div style="border: 1px solid red">
	<p>
	This test verifies that DOM documents are protected against garbage
	collection but without necessarily keeping all their children alive,
	so long as any node in the document is reachable.
	</p>
	<p>
	The output should be the following pieces of text on lines by
	themselves: "B", "[object HTMLElement]", "null", "[object HTMLDocument]".
	</p>
	</div>

	<div id="output">
	</div>

	<iframe id="frame" src='data:text/html,<div id="div"><span id="span-A"><span id="span-B"><span id="span-C">original span</span></span></span></div>'>
	</body>