querySelectorAll vs getElementById

JavaScript performance comparison

Revision 44 of this test case created by shwups

Preparation code

<span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span><span>gix</span>
<p id="foo">bar</p>

Preparation code output

gixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgixgix

bar

Test runner

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Testing in unknown unknown
Test Ops/sec
querySelectorAll
var result = document.querySelectorAll('#foo')[0];
pending…
querySelector
var result = document.querySelector('#foo');
 
pending…
getElementById
var result = document.getElementById('foo');
pending…

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