Run results for: instanceof vs tagname

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser: Chrome 92

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
instanceof	125485.7 Ops/sec
tagName	133206.1 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');