class vs id

JavaScript performance comparison

Revision 4 of this test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div id="main" class="main">
  <div class="interior">
  </div>
</div>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
ID Selector
$('#main')
pending…
Class within id selector
$('#main .interior')
pending…
Class
$('.interior')
pending…
Child class
$('#main').find('.interior')
pending…
Class with tagName
$('div.main')
pending…

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