Run results for: getElementById vs querySelector vs getElementsByTagName pt. 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.0.1

Device Platform: Mobile

Date tested: one year ago

getElementById

8.9M/s

getElementsByTagName

7.6M/s

querySelector tag name

4.2M/s

querySelector element ID

3.7M/s

View exact numbers

Test name	Executions per second
✓ getElementById	8,926,841 Ops/sec
getElementsByTagName	7,583,362 Ops/sec
querySelector tag name	4,168,903 Ops/sec
querySelector element ID	3,694,736 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector element ID
var el = document.querySelector('#testElement'); var className = el.className;
querySelector tag name
var el = document.querySelector('div'); var className = el.className;
getElementsByTagName
var el = document.getElementsByTagName('div'); var className = el.className;