Created
October 21, 2022 22:30
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Sibling selector benchmark
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Sibling selector benchmark</title> | |
| </head> | |
| <body> | |
| <pre id="display"></pre> | |
| <div id="container"></div> | |
| <script type="module"> | |
| const params = new URLSearchParams(location.search) | |
| const num = parseInt(params.get('num')) || 10000 | |
| const type = params.get('type') || 'sibling' | |
| document.addEventListener('DOMContentLoaded', () => { | |
| requestAnimationFrame(() => { | |
| for (let i = 0; i < num; i++) { | |
| container.appendChild(document.createElement('div')) | |
| } | |
| const style = document.createElement('style') | |
| const combinator = type === 'sibling' ? '~' : type === 'descendant' ? ' ' : type === 'adjacentSibling' ? '+' : '>' | |
| style.textContent = ` | |
| p ${combinator} * { color: red } | |
| ` | |
| document.head.appendChild(style) | |
| performance.mark('start') | |
| // requestPostAnimationFrame polyfill | |
| requestAnimationFrame(() => { | |
| addEventListener('message', () => { | |
| performance.measure('total', 'start') | |
| display.innerHTML += `${performance.getEntriesByType('measure').slice(-1)[0].duration}ms\n` | |
| }, {once: true}) | |
| postMessage('', '*') | |
| }) | |
| }) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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