Info

Compare document.querySelectorAll vs document.getElementsByTagName vs a hybrid approach that uses the one fastest in the given browser.

Looks at all elements and pulls out its length to force getElementsByTagName to dereference the live nodeList.

Preparation code

<div>
  <ul>
    <li><a href="#">item 1</a></li>
    <li><a href="#">item 2</a></li>
    <li><a href="#">item 3</a></li>
  </ul>
</div>
<form>
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
</form>
<div>
<p>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
</p>
<p>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
<strong><em><span><a href="#"></a></span></em></strong>
</p>
</div>
<script>
  Benchmark.prototype.setup = function() {
    var f=(/Opera/.test(navigator.userAgent)?document.querySelectorAll:document.getElementsByTagName);
  };
</script>

Preparation code output

Test runner

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Java applet disabled.

var nodes = document.querySelectorAll('*'),
nodelength = nodes.length;

var nodes = document.getElementsByTagName('*'),
nodelength = nodes.length;

var nodes = f.call(document, '*'),
nodelength = nodes.length;

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Andrew Hedges on 22nd September 2010
• Revision 17: published on 20th December 2010
• Revision 20: published by Jeff Larson on 21st January 2011
• Revision 21: published by Sebastian Poreba on 12th March 2011
• Revision 22: published by MONTILLET on 14th June 2011
• Revision 25: published on 27th March 2012
• Revision 26: published on 27th April 2012
• Revision 27: published by Philip Tellis on 28th June 2012
• Revision 28: published by Carl Letourneau on 28th June 2012
• Revision 29: published on 28th June 2012
• Revision 30: published by Philip Tellis on 28th June 2012
• Revision 32: published on 15th July 2012
• Revision 33: published on 17th July 2012
• Revision 34: published on 17th July 2012
• Revision 35: published on 15th August 2012
• Revision 36: published on 15th August 2012
• Revision 37: published by Derp on 19th August 2012
• Revision 38: published on 3rd September 2012
• Revision 39: published on 18th September 2012
• Revision 40: published by Zebulon84 on 11th October 2012
• Revision 41: published by Jim Montgomery on 28th December 2012
• Revision 42: published by Jim Montgomery on 28th December 2012
• Revision 43: published on 28th December 2012
• Revision 44: published by Jim Montgomery on 28th December 2012
• Revision 45: published on 16th February 2013
• Revision 46: published on 26th February 2013
• Revision 47: published on 6th March 2013
• Revision 48: published by Adam on 1st April 2013

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