HTML <abbr> Tag
The browser renders the characters within the <abbr> tag as an abbreviation or an acronym. To decipher the abbreviation, the global title attribute is used (displayed as a pop-up text prompt when you hover the mouse over the abbreviation).
The content of the <abbr> tag in some browsers can be marked with a dotted underscore.
The <abbr> tag comes in pairs, so the closing (</abbr>) tag is required.
<html> <head> <title>Title of the document</title> </head> <body> <p><abbr title="Universal Resource Locator">URL</abbr> - This is a special form of designating an individual resource address on the Internet </p> </body> </html>
URL - This is a special form of designating an individual resource address on the Internet.
(hover your mouse over the abbreviation).