The HTML <b> element defines bold text, without any extra importance.
The HTML <strong> element defines strong text, with added semantic "strong" importance.
This text is bold
This text is strong
The HTML <i> element defines italic text, without any extra importance.
The HTML <em> element defines emphasized text, with added semantic importance.
This text is italic
This text is emphasized
The HTML <small> element defines smaller text.
The HTML <mark> element defines marked or highlighted text.
The HTML <del> element defines deleted (removed) text.
My favorite color is blue red.
The HTML <ins> element defines inserted (added) text.
My favorite color is red.
The HTML <sub> element defines subscripted text.
The HTML <sup> element defines superscripted text.
This is subscripted text.
This is superscripted text.