Run results for: hasAttribute vs. getAttribute vs. classList.contains

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

hasAttribute

6.2M/s

classList single

5.5M/s

getAttribute single

5.1M/s

hasAttribute single

4.6M/s

classList

4.4M/s

getAttribute

3.8M/s

View exact numbers

Test name	Executions per second
✓ hasAttribute	6,228,246 Ops/sec
classList single	5,526,732 Ops/sec
getAttribute single	5,068,336 Ops/sec
hasAttribute single	4,596,078 Ops/sec
classList	4,360,316 Ops/sec
getAttribute	3,814,051 Ops/sec

HTML Preparation code:

<div id="foo" class="foo bar buz ignore" style="display:block" width="500" height="600" title="TEST" is-ignore="true" ignore></div>
<div id="bar" ignore></div>
<div id="buz" is-ignore="true"></div>
<div id="foobar" class="foo ignore"></div>

Tests:

hasAttribute
var element = document.getElementById("foo"); var isIgnored = element.hasAttribute('ignore');
getAttribute
var element = document.getElementById("foo"); var isIgnored = element.getAttribute('is-ignore') === "true";
classList
var element = document.getElementById("foo"); var isIgnored = element.classList.contains('ignore');
hasAttribute single
var element = document.getElementById("bar"); var isIgnored = element.hasAttributes('ignore');
getAttribute single
var element = document.getElementById("buz"); var isIgnored = element.getAttribute('is-ignore') === "true";
classList single
var element = document.getElementById("foobar"); var isIgnored = element.classList.contains('ignore');