abbr tag
This tag indicates the abbreviation of a word. The HTML <abbr> element represents an abbreviation and optionally provides a full description for it.
If present, the title attribute must contain this description and nothing else. The abbreviation is used to provide useful information to the browsers.
Example - 1
<!DOCTYPE html>
<html>
<head>
<title> HTML ABBR Tag </title>
</head>
<body>
<h2> Example of ABBR Tag </h2>
<p> The <abbr title = "World Wide Web"> WWW </abbr> is a global, interactive, dynamic, cross platform, disturbed, graphical hypertext information system. It is a user-friendly, highly intuitive environment developed as a medium of communication for the Internet. The web provides capabilities for graphics, sound and video to be incorporated with the text and newer software includes even more capabilities for multimedia and embedded applications.
</p>
</body>
</html>
Example - 2
<!DOCTYPE html>
<html>
<head>
<title> HTML ABBR Tag </title>
</head>
<body>
<h2> Example of ABBR Tag </h2>
<p> The <abbr title = "Internet Service Provider"> ISP </abbr> is the company that provides you with Internet access, E-mail facilities and a number of a other services. ISPs are directly and permanently connected to the Internet and allow their clients to use a modem to achieve a temporary "dial-up" connection via the telephone line.
</p>
</body>
</html>
NOTES.....
Only the <abbr> tag made it into HTML5, <acronym> has been removed due to redundancy. You may still see it used, but you should use the <abbr> tag instead.