paulfrancis556 opened a new issue, #5276:
URL: https://github.com/apache/netbeans/issues/5276
### Apache NetBeans version
Apache NetBeans 16
### What happened
When adding bootstrap (or other frameworks) in a html/php project using a
CDN directly, the remote file isn't parsed/cached so any CSS class used within
the html page generates a "Class ... not found" error/warning light bulb.
Large projects that use CDNs thus have hundreds of warning light bulbs
unnecessarily.
### How to reproduce
Create a basic HTML or PHP Project.
Put this code in the index.html/index.php file
`
<html>
<head>
<link rel="stylesheet"
href="https//cdnjs.cloudflare.com/ajax/libs/bootstrap/4.5.3/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col">
Hello
</div>
</div>
</div>
</body>
</html>
`
Lines 6, 7 & 8 shows errors/warnings

### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Windows 10
### JDK
19
### Apache NetBeans packaging
Apache NetBeans provided installer
### Anything else
_No response_
### Are you willing to submit a pull request?
No
### Code of Conduct
Yes
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