PerformanceTests/DOM/get-elements-by-class-name-traversal-uncached.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <script src="../resources/runner.js"></script>
 <script>
 function runTest() {
     PerfTestRunner.measureRunsPerSecond({
         description: "This benchmark covers 'getElementsByClassName'.",
         run: function() {
             var testDocument = document.getElementById("testFrame").contentDocument;
             for (var i = 0; i < 10; i++) {
                 var elements = testDocument.getElementsByClassName("example");
                 // Do not access length so that we do not cache the elements.
                 var j = 0;
                 while (elements.item(j++)) { }
             }
         }
     });
 }
 </script>
 </head>
 <body onload="runTest()">
 <iframe id="testFrame" src="../Parser/resources/html5.html" style="display:none" sandbox></iframe>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<script src="../resources/runner.js"></script>
	<script>
	function runTest() {
	PerfTestRunner.measureRunsPerSecond({
	description: "This benchmark covers 'getElementsByClassName'.",
	run: function() {
	var testDocument = document.getElementById("testFrame").contentDocument;
	for (var i = 0; i < 10; i++) {
	var elements = testDocument.getElementsByClassName("example");
	// Do not access length so that we do not cache the elements.
	var j = 0;
	while (elements.item(j++)) { }
	}
	}
	});
	}
	</script>
	</head>
	<body onload="runTest()">
	<iframe id="testFrame" src="../Parser/resources/html5.html" style="display:none" sandbox></iframe>
	</body>
	</html>