Run results for: instanceof vs tagname

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

tagName

335K/s

instanceof

324K/s

View exact numbers

Test name	Executions per second
✓ tagName	334,762 Ops/sec
instanceof	324,283 Ops/sec

HTML Preparation code:

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

Tests:

instanceof
const iframe = document.querySelector('iframe') if(iframe instanceof HTMLIFrameElement) console.log('hi');
tagName
const iframe = document.querySelector('iframe') if(iframe.tagName === 'IFRAME') console.log('hi');