I need css styles that are available for a particular element in html. I
get that information by asking for the IStyleSheetAdapter of the
html DOMNode. The adapter I get actually serves the style sheets well
but seems to fail with import rules (e.g. @import url("global.css");).
How can I get imported sheets? I noted, that the css editor actually
supports the import rules neither (this rule is not present as proposal
in content assist, no properties are displayed). Should I file a bug for
the missing @import rule support?