getElementsByClassName VS querySelectorAll

JavaScript performance comparison

Revision 194 of this test case created by

Preparation code

<div id="asd">
  <ul>
    <li><a href="#" name="name" class="classme">item 1</a></li>
  </ul>
  <ul>
    <li><a href="#" name="name" class="csname">item 1</a></li>
  </ul>
  <div>
    <ul>
      <li><a href="#" name="name" class="classname">item 1</a></li>
    </ul>
  </div>
</div>
<script>
  var nodes;
</script>
    

Preparation code output

<div id="asd"> <ul> <li><a href="#" name="name" class="classme">item 1</a></li> </ul> <ul> <li><a href="#" name="name" class="csname">item 1</a></li> </ul> <div> <ul> <li><a href="#" name="name" class="classname">item 1</a></li> </ul> </div> </div>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementsByClassName
var node = asd.getElementsByClassName('classname')[0];
pending…
querySelectorAll
var node = asd.querySelector('.classname');
pending…
jquery select
pending…

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Revisions

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