Run results for: parentElement/nextElement vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

querySelector

8.5M/s

parentElement/nextElement

2.9M/s

View exact numbers

Test name	Executions per second
✓ querySelector	8,467,193 Ops/sec
parentElement/nextElement	2,925,727 Ops/sec

HTML Preparation code:


<div id=''>
	<div id=''>
  		<div id='start'></div>
	</div>
</div>
<div id='end'></div>

Script Preparation code:

let start = document.querySelector('#start');

Tests: