[motion-1] The syntax of "offset" shorthand is out-of-date #515
Description
After the updating of offset-position and offset-path, we have the offset transform (and create stacking context) only when offset-path is not none. offset-position is used only when offset-path functions don't specify the offset starting position.
So the current syntax of offset shorthand is out-of-date.
[ <'offset-position'>? [ <'offset-path'> [ <'offset-distance'> || <'offset-rotate'> ]? ]? ]! [ / <'offset-anchor'> ]?
The exclamation point (!) doesn't make sense now. It's not necessary to have offset-position if we don't specify offset-path. Perhaps we should always specify offset-path, and move offset-position together with offset-anchor or other places?