Tools/TestWebKitAPI/Tests/mac/JSContextBackForwardCache2.html - WebKit - Git at Google

 <body>
     <div id="test-div"></div>
     <script>
         var testDiv = document.getElementById("test-div");
         if (testDiv.myCustomProperty)
             myConsole.log("ERROR: found myCustomProperty.");
         else
             didCompleteTestSuccessfully();
     </script>
 </body>
	<body>
	<div id="test-div"></div>
	<script>
	var testDiv = document.getElementById("test-div");
	if (testDiv.myCustomProperty)
	myConsole.log("ERROR: found myCustomProperty.");
	else
	didCompleteTestSuccessfully();
	</script>
	</body>