Now that removing a shorthand property works, 'overflow' and '-webkit-border-radius' can be parsed as a shorthand.
Created attachment 12367 [details] Treat the properties as shorthands This leaves 'font' as the only quasi-shorthand. Not sure what to do about it, since it can have special values that don't expand to family, weight, size, variant etc..
Comment on attachment 12367 [details] Treat the properties as shorthands r=me
Committed revision 18815.