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Run results for:
.getElementsByClassName() vs. .querySelectorAll()
Show the performance impact of a live node list (.getElementsByClassName()) vs. a static node list (.querySelectorAll()).
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=592431" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
.querySelectorAll()
17.7M/s
.getElementsByClassName()
307K/s
View exact numbers
Test name
Executions per second
✓
.querySelectorAll()
17,698,132 Ops/sec
.getElementsByClassName()
306,774 Ops/sec
HTML Preparation code:
<div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div> <div class="foo">test</div> <div class="bar">test</div>
Tests:
.getElementsByClassName()
Array.from(document.getElementsByClassName("foo")).forEach(item => {if(item.textContent === "test"){console.log("match")}});
.querySelectorAll()
document.querySelectorAll("foo").forEach(item => {if(item.textContent === "test"){console.log("match")}});