One would hope that different browsers would look for different REL or
CLASS attributes on the <LINK> tag, in order to divine which linked style
sheet was theirs. Maybe each browser developer could adopt a standard
"Content-Type:" extension by which an appropriate linked style sheet could
be recognized.
<link rel=style href="style.w3">
<link rel=style href="style.viola">
Then the server could be configured to send an HTTP header for each one
based on the extension, telling it what kind of style sheet it was on the
Content-Type: header.
Otherwise, I can't imagine how to distinguish them.
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