Run results for: getElementById vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0

Browser: Firefox 106

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
getElementById.childNodes	5038478.0 Ops/sec
getElementById.getElementsByTagName	4096451.0 Ops/sec
getElementsByTagName	5377644.0 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>

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];

Run results for: getElementById vs getElementsByClassName

getElementById vs getElementsByClassName

getElementById.childNodes

getElementById.getElementsByTagName

getElementsByTagName