HTML <dfn> Tags are also called definition tags. It is used to represent a defined word in the context of a definition sentence or sentence in an HTML document. The defined example word is usually the first word in the document.
If a word is contained in the <dfn> element, the browser understands that the nearest text is the definition of the word.
Using the title attribute in the <dfn> Tag, hover over the word written inside <tag>……</tag> will show the title given below. An example is also given below.
HTML <dfn> Tag Example
Example1:-
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTML Dfn Tag</title>
</head>
<body>
<h1>Example of HTML Dfn Tag</h1>
<p><dfn>HTML</dfn> A markup language for Web designing</p>
</body>
</html>
Output:-

HTML <dfn> Tag Example with title Attribute
Example2:-
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTML Dfn Tag</title>
</head>
<body>
<h1>Example of HTML Dfn Tag with title attribute</h1>
<p><dfn title="Hypertext Markup Language">HTML</dfn> A markup language for Web designing</p>
</body>
</html>
Output:-
