Run results for: native fastest selector

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

root.querySelectorAll ".outer"

12K/s

document.querySelectorAll "#root > .outer"

9K/s

root.querySelectorAll "div"

6K/s

View exact numbers

Test name	Executions per second
✓ root.querySelectorAll ".outer"	11,730 Ops/sec
document.querySelectorAll "#root > .outer"	9,196 Ops/sec
root.querySelectorAll "div"	6,056 Ops/sec

HTML Preparation code:

<div id="root"></div>

Script Preparation code:

let root = document.querySelector('#root');
for(let n=1; n<=1000; n++)
	root.insertAdjacentHTML("beforeend", '\n<div class="outer"><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div class="inner">Test</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>');

Tests:

root.querySelectorAll "div"
let root = document.querySelector('#root'); root.querySelectorAll('div');
root.querySelectorAll ".outer"
let root = document.querySelector('#root'); root.querySelectorAll('.outer');
document.querySelectorAll "#root > .outer"
document.querySelectorAll('#root > .outer');