Run results for: parentNode vs firstChild vs nextSibling vs previousSibling (plus bonus: firstChild.nextSibling, querySelectorAlls)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
parentNode	26826356.0 Ops/sec
firstChild	26748734.0 Ops/sec
nextSibling	26863502.0 Ops/sec
previousSibling	27149142.0 Ops/sec
firstChild.nextSibling	22875858.0 Ops/sec
querySelectorAll class	5678987.0 Ops/sec
querySelectorAll data attributed	5027807.0 Ops/sec

HTML Preparation code:

<html>

<body>
    <div id='test'><div class='child' data-t></div><div></div><div></div></div>
</body>

</html>

Script Preparation code:

var parent = document.getElementById('test');
var child1 = parent.children[0]
var child2 = parent.children[1]

Tests: