HTML dfn Element
The <dfn> element marks the term being defined in a sentence or section. It gives semantic meaning to definitions instead of only making text look different.
Syntax
<p><dfn>CSS</dfn> is a language used to style HTML documents.</p>Example
<p>
<dfn>Semantic HTML</dfn> means using elements according to their meaning,
not only according to how they look.
</p>Notes
If the term needs an abbreviation expansion, combine <dfn> with <abbr> or explain the term in surrounding text.