id vs class vs tag selectors

JavaScript performance comparison

Test case created

Preparation code

<p id="foo" class="foo"></p>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 

Preparation code output

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Testing in unknown unknown
Test Ops/sec
id
 
var element = document.getElementById('foo');
 pending…
class
 
var element = document.getElementsByClassName('foo');
 pending…
tag
 
var element = document.getElementsByTagName('p');
 pending…
$(id)
 
var element = $('#foo');
 pending…
$(class)
 
var element = $('.foo');
 pending…
$(tag)
 
var element = $('p');
 pending…

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