<b> Bold </b>
Bold
<i> Italic </i>
Italic
<ins> Inserted </ins>
Inserted
<del> Deleted </del>
Deleted
<mark> Marked </mark>
Marked
<small> Small </small>
Regular Small
<sub> Subscript </sub>
Regular Subscript
<sup> Superscript </sup>
Regular Superscript
See here for more info: w3schools.com - HTML Text Formatting