MeasureThat.net

Run results for: querySelector vs. getElementsByClassName nested dom

Testing querySelector against getElementsByClassName in a larger DOM with multiple target nodes (only one is needed)

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36
Chrome 93
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
querySelector 3840125.2 Ops/sec
getElementsByClassName 3508929.2 Ops/sec
HTML Preparation code:
AخA
 
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<div>
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    <div>
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        <div>
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            <div>
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            </div>
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        </div>
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        <div>
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            <div class="test">
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            </div>
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        </div>
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        <div>
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            <div>
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            </div>
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        </div>
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        <div>
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            <div class="test">
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            </div>
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        </div>
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        <div>
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            <div>
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            </div>
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        </div>
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        <div>
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            <div class="test">
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            </div>
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        </div>
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        <div>
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            <div>
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            </div>
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        </div>
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    </div>
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</div>
Tests:

  • querySelector

     
    document.querySelector(".test")

  • getElementsByClassName

     
    document.getElementsByClassName(".test")?.[0]