Benchmark: classList.contains vs. a

HTML Preparation code:

<div id="foo" class="bar baz"></div>

Script Preparation code:

var test_element = document.getElementById("foo");

Tests:

Rendered benchmark preparation results:

Previous results

Test case name	Result
Add class
Contains class

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36 Edg/99.0.1150.46

Browser/OS: Chrome 99 on Windows

Test name	Executions per second
Add class	3114504.0 Ops/sec
Contains class	9526987.0 Ops/sec

classList.contains vs. a (version: 0)