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 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	5824278.5 Ops/sec
querySelector	3997334.2 Ops/sec
querySelector for some other attribute	4094791.0 Ops/sec
querySelectorAll for some other attribute	2328780.0 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;