Run results for: querySelectorAll custom attribute vs class name

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
custom attribute	1058499.6 Ops/sec
class name	2368529.0 Ops/sec

HTML Preparation code:

<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>
<div class="test" js="test"></div>

Tests:

custom attribute
const test = document.querySelectorAll('[js="test"]');
class name
const test = document.querySelectorAll('.test');