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 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36
Chrome Mobile 124
Android
Mobile
10 months ago
Test name Executions per second
querySelector 2194322.2 Ops/sec
getElementsByClassName 2061792.9 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]