Abbr

The HTML   element is used show the full meaning of an abbreviation or an acronym. Unlike the  element, it is supported in HTML5. The user must hover their cursor over the the selected text in order to view the abbreviation.

Global attributes
See Global HTML Attributes.

It is best to associate this element with the global  attribute to indicate the text to show for the abbreviation.

HTML example:

Rendering
Abbreviations are typically rendered with a dotted line below them.

Coding rules
The element belongs to the Flow content category.