It's done with the <acronym> tag. I just read that HTML5 doesn't support it....lol.... they say use <abbr> instead. IDK if that is it, but I just thought I'd mention it............
HTML <acronym> Tag Deprecated
That's progress for ya....lol

Bet he's using one of them-thar new fangled browsers...... lol again and rofl too. I don't know what was wrong with "acronym" that they felt they absolutely MUST change it to "abbr". lol again.
P.S. The lol's are at the HTML committee, not the poor users..... new upgrade, new problems.
P.P.S 3.6.13 firefox on windows and it works for me........hmmmm....