Comment 46 for bug 747197

It sorta deals with CSS escapes (probably to the extent that it's needed in this
code). Comments are a non-issue, since the only CSS we have to parse are
property values gotten via getPropertyValue(). We're basically parsing
canonicalized values here...

But yes, it would be nice if we could ask the CSS decl for that info, since it
already has it all broken down and has to trouble itself to produce CSS just so
we can reparse it....