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070419. I opened graph/lib/src/org/netbeans/api/visual/widget/doc-files/documentation.html and saw syntax errors on every line of the embedded stylesheet. The message in each case was simply "Syntax error." which doesn't help much.
If I remove the HTML comment tags then it is OK.
...or almost OK; then the </style> is marked as an error!
With the stylesheet surrounded by an HTML comment, the syntax coloring of the CSS is also quite messed up (though it does not appear simply as a solid grey block of comment).
Should be fixed in html lexer. *** This issue has been marked as a duplicate of 102794 ***
Btw, the problem is mostly caused by issue #87014, but I'll do the fix we agreed on.