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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Browser: Firefox 129

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

hasAttribute single

5.0M/s

hasAttribute

5.0M/s

classList single

4.7M/s

classList

4.6M/s

getAttribute single

3.8M/s

getAttribute

3.7M/s

View exact numbers

Test name	Executions per second
✓ hasAttribute single	5,016,304 Ops/sec
hasAttribute	4,976,775 Ops/sec
classList single	4,652,406 Ops/sec
classList	4,611,404 Ops/sec
getAttribute single	3,758,182 Ops/sec
getAttribute	3,680,646 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');