querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 20 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
getElementsByClassName
document.getElementsByClassName("bar");
pending…
querySelectorAll
document.querySelectorAll(".bar");
pending…

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Revisions

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