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header('Link: </visited.php?css&uri='.$_GET["uri"].'>; rel="stylesheet"; type="text/css";');

It's in your source, look.

I meant the source the client-side sees. I know the `Link` header is sent in the application-end source.

And what do you think the client does with this? It downloads the file and implements the CSS rules.

Whether or not it is "hidden" from an average user, doesn't mean you are not using CSS.