Info

Comparison between several different methods of querying the DOM.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div id="idDiv">
 <ul>
  <li></li>
  <li class="selected"></li>
  <li></li>
 </ul>
</div>
<div class="classDiv">
 <ul>
  <li></li>
  <li class="selected"></li>
  <li></li>
 </ul>
</div>
<script>
  Benchmark.prototype.setup = function() {
    var idDiv = $('div#idDiv');
  };
</script>

Preparation code output

Test runner

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var elem = document.getElementById('idDiv');

var elem = $('#idDiv');

var elem = $('div#idDiv');

var elem = $('.classDiv');

var elem = $('div.classDiv');

var elem = document.getElementsByClassName('classDiv');

var elem = $('div.classDiv .selected');

var elem = $('.classDiv li.selected');

var elem = $('div.classDiv li.selected');

var elem = $('.selected', '#idDiv');

var elem = $('.selected', idDiv);

var elem = document.querySelector('#idDiv');

var elem = document.querySelector('div#idDiv');

var elem = document.querySelector('.classDiv');

var elem = document.querySelector('div.classDiv');

var elem = document.querySelectorAll('li');

var elem = $('li');

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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 Tyler Wood on 15th January 2013
• Revision 2: published by Tyler Wood on 16th January 2013

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