HTML5 <abbr> Tag
An abbreviation is marked up as follows:
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Definition and Usage
The <abbr> tag indicates an abbrevation or an acronym, like "WWW" or "NATO".
By marking up abbreviations you can give useful information to browsers, spell checkers, translation systems and search-engine indexers.
Differences Between HTML 4.01 and HTML5
Tips and Notes
Tip: The title attribute is used to show the full version of the expression when you mouse over the abbreviation.
The <abbr> tag also supports the Standard Attributes in HTML5.
The <abbr> tag also supports the Event Attributes in HTML5.