Revision:
The<abbr> tag defines an abbreviation or an acronym, like "HTML", "CSS", "Mr.", "Dr.", "ASAP", "ATM".
Use the global title attribute to show the description for the abbreviation/acronym when you mouse over the element.
It is not necessarily a requirement to use the <abbr> when presenting an abbreviation. It is simply a tag that can be useful in many cases when doing so (for example, using the title attribute to expand on the abbreviation, or using style sheets to apply to the <abbr> element).
<abbr title=" "> . . . </abbr>
The WHO was founded in 1948.
Code:
<p>The <abbr title="World Health Organization">WHO</abbr> was founded in 1948.</p>
CSS is a language that describes the style of an HTML document.
Code:
<p><dfn><abbr title="Cascading Style Sheets">CSS</abbr> </dfn> is a language that describes the style of an HTML document.</p>
example
There are many PMRs
Code:
<p>There are many <abbr title="Physical Matter Realities">PMRs</abbr></p>