Abbreviations are underlined short forms, and full form of these abbreviations are visible when pointers is hovered over this text.
Example
<!DOCTYPE HTML> <html> <head> <title>HTML Abbreviations</title> </head> <body> <p> <abbr title="Organization of the Petroleum Exporting Countries">OPEC</abbr> </p> <p> <abbr title="North Atlantic Treaty Organization">NATO</abbr> </p> <p> <abbr title="United Nations Organization">UNO</abbr> </p> </body> </html>
Output
OPEC
NATO
UNO