Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36 OPR/75.0.3969.93

Browser: Opera 75

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	2200174.0 Ops/sec
querySelector	1329605.0 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;