/opt/project/cpack/swish/lib/swish/highlight.pl
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 css(?Context, ?Selector, -Style) is nondet[multifile, wordlist(highlight)]
Multifile hook to define additional style to apply in a specific context. Currently defined contexts are:
hover
Used for CodeMirror hover extension.
Arguments:
Selector- is a CSS selector, which is refined by Context
Style- is a list of Name(Value) terms.
ClioPatria (version V3.1.1-40-g9d9e003)