querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 21 of this test case created

Preparation code

<p id="foo" class="foo">
  <span class="bar"><span>,,,</span></span>
</p>

Preparation code output

,,,

Test runner

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Testing in unknown unknown
Test Ops/sec
queryselector
document.querySelector("p .bar");
pending…
elementselector
var test = document.getElementsByTagName('p');

test[0].getElementsByClassName('bar');
pending…
querySelector Id
document.querySelector("#foo .bar");
pending…

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Revisions

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