getElementById vs. querySelector

JavaScript performance comparison

Revision 93 of this test case created by

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
      
<script>
Benchmark.prototype.setup = function() {
  var cbar = document.getElementById("bar");

};
</script>

Preparation code output

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

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
bar.innerHTML = "foo";
pending…
querySelector
var bar = document.querySelector("#bar");
bar.innerHTML = "foo";
pending…
cache
cbar.innerHTML = "foo";
pending…

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Revisions

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Foo

Bar

Baz