MeasureThat.net

Run results for: querySelectorAll vs getElementsByTagName with two different tag names

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/117.0
Firefox 117
Windows
Desktop
one year ago
Test name Executions per second
querySelectorAll 128233.9 Ops/sec
getElementsByTagName 188270.5 Ops/sec
HTML Preparation code:
AخA
 
1
<div></div>
2
<div></div>
3
<div></div>
4
<div></div>
5
<div></div>
6
<div></div>
7
<div></div>
8
<div></div>
9
<div></div>
10
<div></div>
11
<a></a>
12
<a></a>
13
<a></a>
14
<a></a>
15
<a></a>
16
<a></a>
17
<a></a>
18
<a></a>
19
<a></a>
20
<a></a>
Tests:

  • querySelectorAll

     
    const allDivsAndAnchors = Array.from(document.querySelectorAll('div, a'));
    allDivsAndAnchors.forEach(function (el) {});

  • getElementsByTagName

     
    const allDivs = document.getElementsByTagName('div');
    const allAnchors = document.getElementsByTagName('a');
    const allDivsAndAnchors = Array.from(allDivs).concat(Array.from(allAnchors));
    allDivsAndAnchors.forEach(function (el) {});