[css3-text] graphical effects and text-decoration

In CSS2.1 we deferred dealing with how 'visibility' affects text decorations.

<u>Some underlined and <i style="visibility: hidden">invisible</i> text.</u>

For CSS3, I'm attempting to define this. Considering the painting model (which
puts decorations immediately over/under the text), I think it makes the most
sense for 'visibility' to affect a piece of text and its text-decorations
together, even though the color and position are taken from the decorating
ancestor.

Related questions come up though: what about 'text-shadow'? What about other
graphical effects, like filters? 'opacity'? A future property for filling text
with a pattern? Should these all have the same answer?

~fantasai