Run results for: Generic TreeWalker vs querySelectorAll vs getElementsByTagName

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
TreeWalker	7318.2 Ops/sec
querySelectorAll	8526.4 Ops/sec
getElementsByTagName	9047.1 Ops/sec

HTML Preparation code:

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</div>

Script Preparation code:

var root = document.getElementById('custom-elements-wrapper');

Tests:

TreeWalker
const treeWalker = document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT); const collection = []; while (treeWalker.nextNode()) { if (treeWalker.currentNode.nodeName.startsWith('X-')) { collection.push(treeWalker.currentNode); } }
querySelectorAll
const elements = root.querySelectorAll('*'); const collection = []; for (let i = 0, item; (item = elements[i]); i += 1) { if (item.nodeName.startsWith('X-')) { collection.push(item); } }
getElementsByTagName
const elements = root.getElementsByTagName('*'); const collection = []; for (let i = 0, item; (item = elements[i]); i += 1) { if (item.nodeName.startsWith('X-')) { collection.push(item); } }