Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.23 Safari/537.36 OPR/75.0.3967.0 (Edition developer)

Browser: Opera 75

Operating system: Mac OS X 11.1.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	3539402.0 Ops/sec
querySelector	2083623.0 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;