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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Browser: Firefox 94

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
hasAttribute	5018489.0 Ops/sec
getAttribute	3639223.0 Ops/sec
classList	4051786.0 Ops/sec
hasAttribute single	5093524.0 Ops/sec
getAttribute single	3599342.0 Ops/sec
classList single	4018586.0 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');

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

hasAttribute

getAttribute

classList

hasAttribute single

getAttribute single

classList single