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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

hasAttribute single

10.7M/s

className

10.2M/s

tagName

8.2M/s

hasAttribute

6.6M/s

getAttribute single

6.5M/s

getAttribute

6.2M/s

classList single

5.2M/s

classList

5.1M/s

View exact numbers

Test name	Executions per second
✓ hasAttribute single	10,699,137 Ops/sec
className	10,223,679 Ops/sec
tagName	8,157,088 Ops/sec
hasAttribute	6,632,098 Ops/sec
getAttribute single	6,492,219 Ops/sec
getAttribute	6,196,778 Ops/sec
classList single	5,155,564 Ops/sec
classList	5,114,788 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');
className
var element = document.getElementById("foobar"); var isIgnored = element.className==='foo bar buz ignore';
tagName
var element = document.getElementById("foobar"); var isIgnored = element.tagName==='DIV';