Surprised to find that Edge/FF return an empty string for GCS CSS shorthands. Webkit browsers return the computed value. cc: @zcorpan

I believe that was required by some/all versions of DOM Level 2 Style

but we haven't followed it for properties that were converted to shorthands

guess I misremembered, then

as promised, developer.microsoft.com/en-u… can you provide the FF one?

bugzil.la/137688 which reminds me that getPropertyValue supposed to return null for shorthands