The 'contains' method found on the Node prototype (Node.prototype.contains) allows you to check whether or not a given Node is contained within another Node - this will give you a true or false return value. It works not only on direct child nodes but also on children of children (the entire subtree).
This method is part of the Document Object Model (DOM) in JavaScript.
In this video I show you a simple example of how exactly this method works using an unordered list element (ul) and a few list item elements (li). It's quite a simple method that could be useful in your future projects.
For your reference, check this out:
https://developer.mozilla.org/en-US/d...
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