Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 13_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/19.0b16042 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 13

Operating system: iOS 13.3.1

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
getElementById	2855356.0 Ops/sec
querySelector	2070150.0 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;