Run results for: childNodes vs children vs firstChild vs firstElementChild

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 OPR/90.0.4480.84

Browser: Opera 90

Operating system: Windows 7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
childNodes[0]	4606513.0 Ops/sec
children[0]	4568770.0 Ops/sec
firstChild	7608515.0 Ops/sec
firstElementChild	7886894.0 Ops/sec

HTML Preparation code:

<html>

<body>
    <div id='test'>
        <div name='a'></div>
        <div name='b'></div>
        <div name='c'></div>
    </div>
</body>

</html>

Script Preparation code:

var parent = document.getElementById('test');

Tests:

childNodes[0]
let n = parent.childNodes[0];
children[0]
let n = parent.children[0];
firstChild
let n = parent.firstChild;
firstElementChild
let n = parent.firstElementChild;

Run results for: childNodes vs children vs firstChild vs firstElementChild

Fastest way to list children

childNodes[0]

children[0]

firstChild

firstElementChild