Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.3998.0 Safari/537.36

Browser: Chrome 81

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	3033979.0 Ops/sec
querySelector	1574845.0 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;