Run results for: DOM selector benchmark about class, data attribute

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36

Browser: Chrome 88

Operating system: Mac OS X 10.14.2

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
class	3439.4 Ops/sec
data attribute	3640.3 Ops/sec

HTML Preparation code:

<div class="bar" data-value="true"></div>
<div class="bar" data-value="true"></div>
<div class="bar" data-value="true"></div>
<div class="bar" data-value="true"></div>
<div class="bar" data-value="false"></div>
<div class="bar" data-value="true"></div>
<div class="bar" data-value="false"></div>
<div class="bar" data-value="false"></div>
<div class="bar" data-value="true"></div>
<div class="bar" data-value="true"></div>

Tests:

class
const $selector = document.querySelectorAll('.bar'); $selector.forEach(element => { if (JSON.parse(element.dataset.value)) { console.log(element.dataset.value); } });
data attribute
const $selector = document.querySelectorAll('[data-value="true"]'); $selector.forEach(element => { console.log(element.dataset.value); });