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Run results for:
getElementById vs getElementsByClassName a
a
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<iframe src="https://measurethat.net/Embed?id=490327" width="100%" height="500px"></iframe>
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
Test name
Executions per second
getElementById
256072.3 Ops/sec
getElementsByClassName
322921.0 Ops/sec
querySelector
327859.8 Ops/sec
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";