Sorry guys, it really should be marked up as follows: <th abbr="Cascading Style Sheet" scope="col">CSS</th> You could even put aq title attribute in there as well if you like.
Not to be picky, but that's wrong. It's the opposite of what's defined in the spec
http://www.w3.org/TR/html4/struct/tables.html#adef-abbr
"abbr = text [CS]
This attribute should be used to provide an abbreviated form of the cell's content, and may be rendered by user agents when appropriate in place of the cell's content. Abbreviated names should be short since user agents may render them repeatedly. For instance, speech synthesizers may render the abbreviated headers relating to a particular cell before rendering that cell's content."
So, correct use of the abbr attribute would be <th abbr="CSS" scope="col">Cascading Style Sheet</th>
which is not what you're after in this case. I'd say use the abbr or acronym (not going to start opening that can of worms again here) element inside the TH, like you originally envisaged.
--
Patrick H. Lauke
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