Run results for: Node parent walking vs node contains

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Contains	8247887.5 Ops/sec
Closest	4168623.2 Ops/sec
parent walking	1681727.2 Ops/sec

HTML Preparation code:

<div class="parent">
  <div>
    <div>
    <div>
    <div>
<div>
    <div>
    <div>
    <div>
    <div>
    <div class="child">
	</div>
	</div>
	</div>
	</div>
	</div>
	</div>
	</div>
	</div>
	</div>
</div>

Script Preparation code:

var parent = document.querySelector(".parent");
var child = document.querySelector(".child");

Tests:

Contains
var x = parent.contains(child)
Closest
var x = child.closest('.parent')
parent walking
let p = child; while (p != null){ if(p == parent ) {break;} p = p.parentNode;}

Run results for: Node parent walking vs node contains

Contains

Closest

parent walking