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The Trinidad library: http://myfaces.apache.org/trinidad/index.html seems to have some attributes whose value is a CSS style. The CSS-related features (code completion, hyperlinking, find usages/refactoring) should be available for these. Namely, the styleClass attribute for many tags in tr.tld (URL http://myfaces.apache.org/trinidad).
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss