The <dfn> tag in HTML represents definition element and is used to representing a defining instance in HTML. 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:
HTML
<!DOCTYPE html>
< html >
< body >
< p >< dfn >Geeksforgeeks</ dfn > is a portal for geeks.</ p >
</ body >
</ html >
|
Output:

Example 2: Using title attribute of the <dfn> tag.
HTML
<!DOCTYPE html>
< html >
< body >
< p >< dfn title = "Geeksforgeeks" >GFG</ dfn >
is a portal for geeks.</ p >
</ body >
</ html >
|
Output:

Example 3: Using title attribute of the <abbr> tag inside the <dfn> element.
HTML
<!DOCTYPE html>
< html >
< body >
< p >< dfn >< abbr title = "Geeksforgeeks" >GFG</ abbr >
</ dfn > is a portal for geeks.</ p >
</ body >
</ html >
|
Output:

Example 4: Using id attribute along with the <dfn> tag.
HTML
<!DOCTYPE html>
< html >
< body >
< p >< dfn id = "Geeksforgeeks" >GFG</ dfn > is a
portal for geeks.</ p >
< p >Practice questions for cracking
technical interviews.</ p >
< p >Prepare for GATE CSE – 2019</ p >
< p >Visit < a href = "#Geeksforgeeks" >GFG</ a >.</ p >
</ body >
</ html >
|
Output:

Supported Browsers:
- Google Chrome
- Edge 12 and above
- Internet Explorer
- Firefox 1 and above
- Opera
- Safari