/swish/lib/highlight.pl
All Application Manual Name SummaryHelp

 css(?Context, ?Selector, -Style) is nondet[multifile, swish(lib/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.