4 <script src="../resources/runner.js"></script>
5 <div id="sandbox" style="display:none"></div>
7 var sandbox = document.getElementById('sandbox');
9 for (var i = 0; i < 1000; ++i)
10 sandbox.appendChild(document.createElement('div'));
11 var html = sandbox.innerHTML;
13 var observer = new WebKitMutationObserver(listener);
14 var tickledSpan = document.createElement('span');
15 observer.observe(tickledSpan, {attributes: true});
17 function resetState() {
24 tickledSpan.setAttribute('data-foo', numRuns);
27 function listener(mutations) {
29 var time = Date.now() - start;
31 PerfTestRunner.log(time);
36 for (var i = 0; i < 100; ++i)
37 sandbox.innerHTML = html;
39 PerfTestRunner.logStatistics(times);
41 observer.observe(sandbox, {childList: true});
44 PerfTestRunner.log('\n------------\n');
45 PerfTestRunner.log('Running ' + numRuns + ' times with observation');
46 setTimeout(runAgain, 0);
52 PerfTestRunner.log('Running ' + numRuns + ' times without observation');
53 window.addEventListener('load', runAgain);