querySelectorAll vs getElementsByTagName

JavaScript performance comparison

Revision 20 of this test case created by Jeff Larson

Preparation code

<div>
  <ul id="list" class="foo">
    <li><a href="#">item 1</a></li>
    <li><a href="#">item 2</a></li>
    <li><a href="#">item 3</a></li>
  </ul>
</div>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
querySelectorAll
var nodes = document.querySelectorAll('ul')
pending…
getElementsByTagName
var nodes = document.getElementsByTagName('ul')
pending…
getElementsByClassName
var nodes = document.getElementsByClassName('foo')
pending…
getElementById
var nodes = document.getElementById('list')
pending…
querySelectorAll class name
var nodes = document.querySelectorAll('.foo')
pending…
querySelectorAll ID
var nodes = document.querySelectorAll('#list')
pending…

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