Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

Browser: Firefox 66

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
getElementById	2760984.0 Ops/sec
querySelector	3081560.0 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;