With issue #144[1] being left undefined per the meeting notes[2] from the CSS F2F meeting in Oslo, it seems as if the text-decoration-visibility-### cases need updating. I figured I should notify you so you know the updates that need to be made in order for the cases to be valid again. It should be a simple change. I think in most cases you can just change "must" to "may" (don't forget to add the "may" flag too).
1. http://wiki.csswg.org/spec/css2.1#issue-144
2. http://www.w3.org/2010/08/23-CSS-irc
07:45:39 <TabAtkins_> RESOLVED: Leave issue 144 officially undefined, add a note that it will be resolved in css3.
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Thanks,
Arron Eicholz