Run results for: querySelectorAll vs getElementsByClassName performance test for demo

Run details:

User agent: Mozilla/5.0 (Android 16; Mobile; rv:140.0) Gecko/140.0 Firefox/140.0

Browser: Firefox Mobile 140

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
✓ getElementsByClassName	6,052,661 Ops/sec
querySelectorAll	1,239,465 Ops/sec

HTML Preparation code:

<ul>
        <li class="list">Text Element 1</li>
        <li class="list">Text Element 2</li>
        <li class="list">Text Element 3</li>
        <li class="list">Text Element 4</li>
        <li class="list">Text Element 5</li>
        <li class="list">Text Element 6</li>
        <li class="list">Text Element 7</li>
        <li class="list">Text Element 8</li>
        <li class="list">Text Element 9</li>
        <li class="list">Text Element 10</li>
        <li class="list">Text Element 11</li>
        <li class="list">Text Element 12</li>
        <li class="list">Text Element 13</li>
        <li class="list">Text Element 14</li>
        <li class="list">Text Element 15</li>
        <li class="list">Text Element 16</li>
        <li class="list">Text Element 17</li>
        <li class="list">Text Element 18</li>
        <li class="list">Text Element 19</li>
        <li class="list">Text Element 20</li>
    </ul>

Run results for: querySelectorAll vs getElementsByClassName performance test for demo

Compare javascript selector performance

querySelectorAll

getElementsByClassName