PerformanceTests/Interactive/SelectAll.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <body>
 <script src="../resources/runner.js"></script>
 <script>

 PerfTestRunner.prepareToMeasureValuesAsync({
     unit: 'ms',
     done: function () {
         var iframe = document.querySelector('iframe');
         iframe.parentNode.removeChild(iframe);
     }
 });

 function runTest() {
     var iframe = document.querySelector('iframe');
     iframe.contentWindow.getSelection().removeAllRanges();
     iframe.contentDocument.body.offsetTop;

     setTimeout(function () {
         var startTime = PerfTestRunner.now();
         iframe.contentDocument.execCommand('SelectAll');
         iframe.contentDocument.body.offsetTop;
         setTimeout(function () {
             if (!PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime))
                 return;
             PerfTestRunner.gc();
             setTimeout(runTest, 0);
         }, 0);
     }, 0);
 }

 </script>
 <iframe src="../Parser/resources/html5.html" onload="runTest()" width="800" height="600">
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<body>
	<script src="../resources/runner.js"></script>
	<script>

	PerfTestRunner.prepareToMeasureValuesAsync({
	unit: 'ms',
	done: function () {
	var iframe = document.querySelector('iframe');
	iframe.parentNode.removeChild(iframe);
	}
	});

	function runTest() {
	var iframe = document.querySelector('iframe');
	iframe.contentWindow.getSelection().removeAllRanges();
	iframe.contentDocument.body.offsetTop;

	setTimeout(function () {
	var startTime = PerfTestRunner.now();
	iframe.contentDocument.execCommand('SelectAll');
	iframe.contentDocument.body.offsetTop;
	setTimeout(function () {
	if (!PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime))
	return;
	PerfTestRunner.gc();
	setTimeout(runTest, 0);
	}, 0);
	}, 0);
	}

	</script>
	<iframe src="../Parser/resources/html5.html" onload="runTest()" width="800" height="600">
	</body>
	</html>