Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 13310.93.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.133 Safari/537.36

Browser: Chrome 85

Operating system: Chrome OS 13310.93.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	938271.0 Ops/sec
querySelector	570567.8 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;