Run results for: form.elements vs getElementsByTagName vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.113 Safari/537.36

Browser: Chrome 81

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
form.elements	378024.2 Ops/sec
getElementsByTagName	431222.4 Ops/sec
querySelectorAll	265764.2 Ops/sec
getElementsByClassName	522107.2 Ops/sec
getElementsByName	586689.4 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:

form.elements
var formelem = doc.getElementById('testform').elements; for (i = 0, imax = formelem.length; i < imax; i += 1) { var elemvalue = formelem[i].value; }
getElementsByTagName
var formelem = doc.getElementById('testdiv').getElementsByTagName('input'); for (i = 0, imax = formelem.length; i < imax; i += 1) { var elemvalue = formelem[i].value; }
querySelectorAll
var formelem = doc.getElementById('testdiv').querySelectorAll('[data-unique]'); for (i = 0, imax = formelem.length; i < imax; i += 1) { var elemvalue = formelem[i].value; }
getElementsByClassName
var formelem = doc.getElementById('testdiv').getElementsByClassName('unique'); for (i = 0, imax = formelem.length; i < imax; i += 1) { var elemvalue = formelem[i].value; }
getElementsByName
var formelem = doc.getElementsByName('unique'); for (i = 0, imax = formelem.length; i < imax; i += 1) { var elemvalue = formelem[i].value; }

Run results for: form.elements vs getElementsByTagName vs querySelectorAll

Test different ways of getting form elements to see if in certain fringe cases if you can improve performance.

form.elements

getElementsByTagName

querySelectorAll

getElementsByClassName

getElementsByName