How to represent the defining instance of a term in Html?

In this article, we represent the defining instance of a term by using the dfn Element, Generally, the defining instance is the first use of a term in a document. The <dfn> tag requires a starting as well as an ending tag.

Syntax:

<dfn>.....</dfn>

Below examples illustrate the dfn tag in HTML:
Example-1:

<!DOCTYPE html> 
<html> 
    <head> 
        <title>Represent the defining 
               instance of a term
        </title> 
    </head> 
    <body>
        <h2>GeeksForGeeks</h2> 
        <h2>HTML5: How to represent the defining
                instance of a term
        </h2>
 <p><dfn>Geeksforgeeks</dfn> is a portal for geeks.</p> 
    </body> 
</html>

Output

Example-2:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Represent the defining instance of a term</title>
</head>
<body>
<p><dfn>WHO</dfn> stands for World Health Organisation</p>  
</body>
</html>