Run results for: querySelectorAll vs. getElementsByTagName

Run details:

User agent: Mozilla/5.0 (X11; Linux aarch64; rv:102.0) Gecko/20100101 Firefox/102.0

Browser: Firefox 102

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
querySelectorAll	252054.6 Ops/sec
getElementsByTagName	432532256.0 Ops/sec

HTML Preparation code:

<table id="data-table">
  <tr>
    <th colspan="6">Results</th>
  </tr>
  <tr>
    <td>No</td>
    <td>Competition</td>
    <td>John</td>
    <td>Adam</td>
    <td>Robert</td>
    <td>Paul</td>
  </tr>
  <tr>
    <td>1</td>
    <td>Swimming</td>
    <td>1:30</td>
    <td>2:05</td>
    <td>1:15</td>
    <td>1:41</td>
  </tr>
  <tr>
    <td>2</td>
    <td>Running</td>
    <td>15:30</td>
    <td>14:10</td>
    <td>15:45</td>
    <td>16:00</td>
  </tr>
  <tr>
    <td>3</td>
    <td>Shooting</td>
    <td>70%</td>
    <td>55%</td>
    <td>90%</td>
    <td>88%</td>
  </tr>
</table>

Script Preparation code:

var dataTable = document.getElementById('data-table');

Tests:

querySelectorAll
dataTable.querySelectorAll("tr")
getElementsByTagName
dataTable.getElementsByTagName('TR')