querySelector vs. getElementsByTagName

JavaScript performance comparison

Revision 66 of this test case created

Info

Compare the speed of querySelector("#...") getElementsByTagName(*) with a filter function (for sub selects)

Preparation code

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

Preparation code output

Foo

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementsByTagName
var bar = [].filter.call(root.getElementsByTagName("*"), function(e) { return e.id === "bar" })[0]
pending…
querySelector
var bar = root.querySelector("#bar");
pending…

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