| <!DOCTYPE html> |
| <body> |
| <pre id="log"></pre> |
| <script src="../resources/runner.js"></script> |
| <div id="sandbox" style="display:none"></div> |
| <script> |
| var sandbox = document.getElementById('sandbox'); |
| var observing = false; |
| for (var i = 0; i < 1000; ++i) |
| sandbox.appendChild(document.createElement('div')); |
| var html = sandbox.innerHTML; |
| |
| var observer = new WebKitMutationObserver(listener); |
| var tickledSpan = document.createElement('span'); |
| observer.observe(tickledSpan, {attributes: true}); |
| |
| function resetState() { |
| window.start = null; |
| window.numRuns = 25; |
| window.times = []; |
| } |
| |
| function runAgain() { |
| tickledSpan.setAttribute('data-foo', numRuns); |
| } |
| |
| function listener(mutations) { |
| if (start) { |
| var time = Date.now() - start; |
| times.push(time); |
| PerfTestRunner.log(time); |
| } |
| if (numRuns-- >= 0) { |
| runAgain(); |
| start = Date.now(); |
| for (var i = 0; i < 100; ++i) |
| sandbox.innerHTML = html; |
| } else { |
| PerfTestRunner.logStatistics(times); |
| if (!observing) { |
| observer.observe(sandbox, {childList: true}); |
| observing = true; |
| resetState(); |
| PerfTestRunner.log('\n------------\n'); |
| PerfTestRunner.log('Running ' + numRuns + ' times with observation'); |
| setTimeout(runAgain, 0); |
| } |
| } |
| } |
| |
| resetState(); |
| PerfTestRunner.log('Running ' + numRuns + ' times without observation'); |
| window.addEventListener('load', runAgain); |
| </script> |
| </body> |
