Run results for: getElementById vs getElementsByClassName a

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

querySelector

328K/s

getElementsByClassName

323K/s

getElementById

256K/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";