querySelector vs querySelectorAll vs getElementById vs getElementsByClassName vs getElementsByTagName

JavaScript performance comparison

Revision 16 of this test case created by Uuuuh

Preparation code

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

Preparation code output

,,,

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Testing in unknown unknown
Test Ops/sec
querySelector
document.querySelector("#foo .bar span");
pending…
querySelectorAll
document.querySelectorAll("#foo .bar span")[0];
pending…
getElementById
document.getElementById("foo").getElementsByClassName('bar')[0].getElementsByTagName("span")[0];
pending…
getElementsByClassName
document.getElementsByClassName("foo")[0].getElementsByClassName('bar')[0].getElementsByTagName("span")[0];
pending…
getElementsByTagName
document.getElementsByTagName("p")[0].getElementsByClassName('bar')[0].getElementsByTagName("span")[0];
pending…

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