| <!DOCTYPE html> |
| <title>Hit-testing block children</title> |
| <script src="../resources/runner.js"></script> |
| <body> |
| <div id="container"></div> |
| <script> |
| let y = 100; |
| |
| function createTree(container) { |
| for (let i = 0; i < 20000; ++i) { |
| const div = document.createElement('div'); |
| div.textContent = i; |
| container.appendChild(div); |
| } |
| } |
| |
| function setup() { |
| container.textContent = ''; |
| createTree(container); |
| } |
| |
| function test() { |
| for (let i = 0; i < 10; ++i) { |
| document.elementFromPoint(100, y); |
| ++y; |
| } |
| } |
| |
| function run() { |
| PerfTestRunner.measureTime({ |
| description: `Measures performance of hit-testing block children.`, |
| run: test |
| }); |
| } |
| |
| setup(); |
| run(); |
| </script> |
| </body> |
