Run results for: .createHTMLDocument() vs DOMParser() vs .createContextualFragment()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

.createHTMLDocument() + .innerHTML

226.8M/s

DOMParser

218.0M/s

Nested .createElement() + .appendChild()

213.7M/s

View exact numbers

Test name	Executions per second
✓ .createHTMLDocument() + .innerHTML	226,807,072 Ops/sec
DOMParser	218,004,352 Ops/sec
Nested .createElement() + .appendChild()	213,679,568 Ops/sec

Script Preparation code:

const count = 20_000;
const testString = '<div>' + (new Array(count)).fill('').join('<b>x</b>') + '</div>';

Tests:

.createHTMLDocument() + .innerHTML
function test_createHTMLDocument() { const doc = document.implementation.createHTMLDocument(''); doc.body.innerHTML = testString; return doc.body; }
DOMParser
function test_DOMParser() { return (new DOMParser()).parseFromString(testString, 'text/html').body; }
Nested .createElement() + .appendChild()
function test_documentFragment() { return document.createRange().createContextualFragment(testString); }