kengr

From the browser rendering engine point of view, there's (currently) no difference between ABBR and ACRONYM; if you hold (as I do) that HTML should be used strictly for semantic markup, then the proper one to use would be ABBR rather than ACRONYM.

Well, my main reason for adding it at all is because (I'm told) many screen readers will treat things flagged with ABBR or ACRONYM in a manner that makes it easier for blind users to understand the text.

No idea if the readers will treat the two tags differently. But if they'll get stuff prounounced letter by letter instead of trying to turn them into a word, that'll be a bonus.