HTML abbr tag

The <abbr> tag defines an abbreviation or an acronym, like “HTML”, “CSS”, “Mr.”. Use the title attribute to show the description for the abbreviation when you mouse over the element:

<abbr title="Cascading Style Sheets">CSS</abbr>

<abbr> can also be used with <dfn> to define an abbreviation:

<p><dfn><abbr title="Cascading Style Sheets">CSS</abbr>
</dfn> describes the style of an HTML document.</p>

You can style abbr tag like this:

abbr {
  text-decoration: underline red dotted;
  color: red;
}

abbr:hover {
  cursor: help;
}