Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36 OPR/70.0.3728.178

Browser: Opera 70

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	3390205.0 Ops/sec
querySelector	1823247.0 Ops/sec

HTML Preparation code:

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

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;