Try it Live - HTML dfn tag

​x
 
<!DOCTYPE html>
<html>
  <head>
    <title>Example for HTML dfn Tag</title>
  </head>
  <body>
    <p>
      <dfn>WWW</dfn> stands for World wide web where documents and other web resources are identified by URLs.
    </p>
  </body>
</html>
​