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Run results for:
querySelector(class) vs classList.contains
HTML DOM querySelector, vs looking into classList of element which already have
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<iframe src="https://measurethat.net/Embed?id=517341" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Browser:
Chrome 123
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
querySelector
1568046.0 Ops/sec
classList.contains
4936618.0 Ops/sec
querySelector after more HTML elements
875125.3 Ops/sec
classList.contains after more HTML elements
4812829.5 Ops/sec
HTML Preparation code:
<div class='a'>try</div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div>v <div class='a b'>this</div> <div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div><div class='a'></div> <div class='a c'>howAboutMoreElements</div>
Script Preparation code:
function querySelectorWrapper(className) { return !document.querySelector('.' + className); } function classListContainsWrapper(element, className) { return element.classList.contains(className); } var elementRefB = document.querySelector('.b'); var elementRefC = document.querySelector('.c');
Tests:
querySelector
querySelectorWrapper('b');
classList.contains
classListContainsWrapper(elementRefB, 'b');
querySelector after more HTML elements
querySelectorWrapper('c');
classList.contains after more HTML elements
classListContainsWrapper(elementRefC, 'c');