document.head

JavaScript performance comparison

Revision 2 of this test case created by Charles Lehner

Info

How much faster is the HTML5 document.head DOM tree accessor compared to its old-school variant, document.getElementsByTagName('head')[0]?

Preparation code

<script>
  document.head = document.head || document.getElementsByTagName('head')[0];
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
document.getElementsByTagName('head')[0]
document.getElementsByTagName('head')[0];
pending…
document.head
document.head;
pending…
document.documentElement.firstChild
document.documentElement.firstChild;
pending…

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