Netbeans 15 - how to recognise external stylesheet css in code hints?

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I am new to Netbeans version 15.
I've been using Dreamweaver for 20+ years.
I use external stylesheets like this <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> Dreamweaver is very nice and shows code hints from these external stylesheets.
How do I get Netbeans to do that as well?
Netbeans shows "class not found" and suggests I create it.

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