Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/132.0.6834.100 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 132

Operating system: iOS 18.2.1

Device Platform: Mobile

Date tested: one year ago

getElementById

79.2M/s

querySelector

9.4M/s

View exact numbers

Test name	Executions per second
✓ getElementById	79,220,792 Ops/sec
querySelector	9,443,547 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;