getElementById vs. querySelector

JavaScript performance comparison

Revision 230 of this test case created by

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<div id="content">
  <p>Child</p>
</div>
    

Preparation code output

<p id="foo">Foo</p> <p id="bar">Bar</p> <p id="baz">Baz</p> <div id="content"> <p>Child</p> </div>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
getElementById - Child
var el = document.getElementById("content");
el.querySelector('p');
pending…
querySelector - Child
var el = document.querySelector("#content p");
pending…

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Foo

Bar

Baz

Child