xxxxxxxxxx<html> <head> <style> sub { vertical-align: sub; font-size: smaller; color: red; font-style: arial; font-weight: bold; } </style> </head> <body> <h1>How to Style sub element example</h1> <p>You can style the <code>sub</code> element by targeting the element with CSS declarations.</p> <p>H<sub>2</sub>O</p> </body></html>