| <!DOCTYPE html> |
| <script src="../resources/runner.js"></script> |
| <title>Tracking the performance of self-painting layers</title> |
| <style> |
| #listContainer { |
| margin: 0 auto; |
| width: 600px; |
| position: relative; |
| } |
| |
| .listItem { |
| outline: 2px solid green; |
| overflow: hidden; |
| position: relative; |
| } |
| </style> |
| </head> |
| |
| <body> |
| <pre id="log"></pre> |
| |
| <div id="listContainer"></div> |
| <script> |
| const LOREM_IPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."; |
| |
| let listContainer = null; |
| function createListItem() { |
| let item = document.createElement("div"); |
| item.classList.add("listItem"); |
| item.textContent = LOREM_IPSUM.substr( |
| Math.floor(Math.random() * 100), Math.floor(Math.random() * 200) + 150); |
| listContainer.appendChild(item); |
| } |
| |
| function setupTest() { |
| listContainer = document.getElementById("listContainer"); |
| for (let i = 0; i < 10000; ++i) |
| createListItem(); |
| window.requestAnimationFrame(runTest); |
| } |
| |
| let isDone = false; |
| PerfTestRunner.prepareToMeasureValuesAsync({ done: done, unit: 'ms' }); |
| function done() { |
| isDone = true; |
| listContainer.innerHTML = ""; |
| } |
| |
| let startTime; |
| let height = 0; |
| function runTest() { |
| if (startTime) |
| PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime); |
| |
| if (!isDone) { |
| startTime = PerfTestRunner.now(); |
| listContainer.firstChild.style.height = height + "px"; |
| height++; |
| window.requestAnimationFrame(runTest); |
| } |
| } |
| |
| onload = setupTest; |
| </script> |
| </body> |
| </html> |
