Run results for: node.contains() vs node.parentNode

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 YaBrowser/25.6.0.0 Safari/537.36

Browser: Yandex Browser 25

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
node.contains	7762992.0 Ops/sec
node.parentNode	732135.6 Ops/sec

HTML Preparation code:

<script
  src="https://code.jquery.com/jquery-3.4.1.min.js"
  integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
  crossorigin="anonymous"></script>

<div id="outer">
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div id="inner">

</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>


<div id="outer2">
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div id="inner2">

</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

Script Preparation code:

var inner = document.getElementById("inner");
var outer = document.getElementById("outer");
var inner2 = document.getElementById("inner2");
var outer2 = document.getElementById("outer2");

Tests:

node.contains
var x = outer.contains(inner) var y = outer.contains(inner2) var z = outer2.contains(inner) var a = outer2.contains(inner2)
node.parentNode
function isDescendant(parent, child) { var node = child.parentNode; while (node != null) { if (node == parent) { return true; } node = node.parentNode; } return false; } var x = isDescendant(outer, inner); var y = isDescendant(outer, inner2); var z = isDescendant(outer2, inner); var a = isDescendant(outer2, inner2);