Run results for: form.elements vs getElementsByTagName vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

getElementsByName

3.3M/s

form.elements

3.1M/s

getElementsByTagName

2.9M/s

getElementsByClassName

2.8M/s

querySelectorAll

1.4M/s

View exact numbers

Test name	Executions per second
✓ getElementsByName	3,288,442 Ops/sec
form.elements	3,118,235 Ops/sec
getElementsByTagName	2,904,630 Ops/sec
getElementsByClassName	2,785,918 Ops/sec
querySelectorAll	1,389,307 Ops/sec

HTML Preparation code:

<form id="testform">
  <input value="test" />
  <input value="testing" />
</form>
<div id="testdiv">
  <input class="unique" name="unique" data-unique="1" value="test" />
  <input class="unique" name="unique" data-unique="1" value="testing" />
  <!-- added following divs to try and knock getElementsByClassName and getElementsByName out of the running-->
  <div class="test1" name="test1">
    <div class="test6" name="test6">&nbsp;</div>
  </div>
  <div class="test2" name="test2">
    <div class="test7" name="test7">&nbsp;</div>
  </div>
  <div class="test3" name="test3">
    <div class="test8" name="test8">&nbsp;</div>
  </div>
  <div class="test4" name="test4">
    <div class="test9" name="test9">&nbsp;</div>
  </div>
  <div class="test5" name="test5">
    <div class="test1" name="test1">&nbsp;</div>
  </div>
</div>

Script Preparation code:

var i, imax;
var doc = document;

Tests: