querySelectorAll vs getElementsByTagName

JavaScript performance comparison

Revision 22 of this test case created by MONTILLET

Preparation code

<div id="test">
  <ul>
    <li>
      <a href="#">1</a>
    </li>
    <li>
      <a href="#">2</a>
    </li>
    <li>
      <a href="#">3</a>
    </li>
  </ul>
</div>
<script>
  var slice = Array.prototype.slice;
  
  function toArray(a) {
    return slice.call(a);
  }
  
  var div = document.getElementById('test');
  
  function test(a) {
    if (a.map(function(e) {
      return e.innerHTML;
    }).join('') !== '123') {
      throw new Error('Wrong result!');
    }
  }
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
querySelectorAll
 
test(toArray(div.querySelectorAll('a')))
 pending…
getElementsByTagName
 
test(toArray(div.getElementsByTagName('a')))
 pending…

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