Run results for: document getElementsByTagName vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 6 months ago

getElementsByTagName

56.3M/s

querySelectorAll

12.1M/s

View exact numbers

Test name	Executions per second
✓ getElementsByTagName	56,324,228 Ops/sec
querySelectorAll	12,095,381 Ops/sec

HTML Preparation code:

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

Tests: