Run results for: getElementById vs querySelector vs querySelector for some other attribute vs querySelectorAll for some other attribute

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Browser: Firefox 91

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	4646172.0 Ops/sec
querySelector	3148892.8 Ops/sec
querySelector for some other attribute	1719002.4 Ops/sec
querySelectorAll for some other attribute	842650.2 Ops/sec

HTML Preparation code:

<div id="testElement" at="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;
querySelector for some other attribute
var el = document.querySelector('[at="testElement"]'); var className = el.className;
querySelectorAll for some other attribute
var el = document.querySelectorAll('[at="testElement"]'); var className = el[0].className;