Run results for: getElementById vs getElementsByClassName a

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

querySelector

241K/s

getElementsByClassName

233K/s

getElementById

199K/s

View exact numbers

HTML Preparation code:

<div id="a" class="b"></div>

Tests:

getElementById
document.getElementById('a'); a.innerHTML="abc";
getElementsByClassName
let b = document.getElementsByClassName('b')[0]; b.innerHTML="def";
querySelector
let c =document.querySelector(".b"); c.innerHTML="ghi";