To tag qualify or not

Benchmark created by Clemens on

Description

What's faster in jQuery? div.classname or .classname? div.id or #id?

Preparation HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div class="testClass">What up?</div>
<div id="testId">I'm good?</div>

Test runner

Ready to run.

Testing in
TestOps/sec
tag-qualified class
var elem = $('div.testClass');
ready
classname only
var elem = $('.testClass');
ready
tag-qualified ID
var elem = $('div#testId');
ready
ID only
var elem = $('#testId');
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.