Run results for: getElementById.getElementsByClassName vs getElementsByClassName vs getElementById.childNodes vs document.forms

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36 OPR/62.0.3331.72

Browser: Opera 62

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById.childNodes	1442033.0 Ops/sec
getElementById.getElementsByTagName	1188800.0 Ops/sec
getElementsByTagName	1502627.0 Ops/sec
document.forms[0]	1076588.0 Ops/sec

HTML Preparation code:

<div id="header">
		<div id="logo">
			<img src="images/logo.png" alt="the network"/>
		</div>	
		<div id="search">
			<form method="get">
				<input type="text" name="post" placeholder="thoughts?"/>
				<input type="submit" value="Post">
			</form>
		</div>
	</div>
</div>	
<div id="page">
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
  <p>some message</p>
</div>

Tests:

getElementById.childNodes
var form = document.getElementById("search").childNodes[0];
getElementById.getElementsByTagName
var form = document.getElementById("search").getElementsByTagName("form")[0];
getElementsByTagName
var form = document.getElementsByTagName("form")[0];
document.forms[0]
var form = document.forms[0];

Run results for: getElementById.getElementsByClassName vs getElementsByClassName vs getElementById.childNodes vs document.forms

getElementById vs getElementsByClassName

getElementById.childNodes

getElementById.getElementsByTagName

getElementsByTagName

document.forms[0]