Run results for: Generic TreeWalker vs querySelectorAll vs getElementsByTagName

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
TreeWalker	2613.4 Ops/sec
querySelectorAll	3883.9 Ops/sec
getElementsByTagName	4299.6 Ops/sec

HTML Preparation code:

<div id="custom-elements-wrapper">
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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); } }