Indicates an abbreviation or an acronym.
The global title attribute can be used in the
abbr tag to show the full version of the abbreviation/acronym when you mouse over the
abbr was introduced in Microsoft Internet Explorer 6 This property can be used for rendering to non-visual media such as speech or Braille. There is no functionality implemented for this property unless defined by the author.
Microsoft Developer Network: [Windows Internet Explorer API reference Article]