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

Benchmark engine: Benchmark.js

previousSibling

27.1M/s

nextSibling

26.9M/s

parentNode

26.8M/s

firstChild

26.7M/s

firstChild.nextSibling

22.9M/s

querySelectorAll class

5.7M/s

querySelectorAll data attributed

5.0M/s

View exact numbers

Test name	Executions per second
✓ previousSibling	27,149,142 Ops/sec
nextSibling	26,863,502 Ops/sec
parentNode	26,826,356 Ops/sec
firstChild	26,748,734 Ops/sec
firstChild.nextSibling	22,875,858 Ops/sec
querySelectorAll class	5,678,987 Ops/sec
querySelectorAll data attributed	5,027,807 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: