[css-text-decor] Update to account for sideways-lr/rl

The Text Decoration module does certain special things for vertical
writing modes; it should be fixed/clarified to make sure it does
the appropriate things for sideways-lr/rl modes (i.e. don't use
vertical typographic conventions, use horizontal ones rotated 90deg).

~fantasai

Received on Tuesday, 15 March 2016 20:16:35 UTC