class vs id

JavaScript performance comparison

Test case created by SKS

Preparation code

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

Preparation code output

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Testing in unknown unknown
Test Ops/sec
ID Selector
$('#main')
pending…
Class selector
$('.main')
pending…
Class with :first
$('.main:first')
pending…
Class with tagName
$('div.main')
pending…

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