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HTML

HTML 5

CSS 2.1

CSS 3

Reference

HTML <acronym> Element

The <acronym> element defines an acronym. An acronym is a word formed from the initial letters of a name or group of words such as radar (radio detection and ranging) or ABBA (Agnetha, Bjorn, Benny, and Anni-Frid).

Using this element doesn't immediately change what is displayed on the screen. i.e.

World War II saw the birth of the <acronym>radar</acronym> system.

Displays as:
World War II saw the birth of the radar system.

But as with the <abbr> element it can be used in conjunction with the title attribute to display the full length version:

World War II saw the birth of the <acronym title="radio detection and ranging"> radar</acronym>sysyem.

Gives:
World War II saw the birth of the radar system.

Mouse over the word radar above and the full length version is displayed unlike in the example where the title attribute is not used.

NOTE:The <acronym> element has not been included in the HTML 5 specification because it has created a lot of confusion. Use instead the <abbr> element.

HTML 4 Element List