HTML tags that are not commonly used but useful

sub sup

<p>这个文本包含 <sub>111</sub>文本。</p>
<p>这个文本包含 <sup>上标</sup> 文本。</p>

• The subscript text will be displayed below the baseline which is half the height of the characters in the current text flow, but the font and font size of the text in the current text flow are the same. Subscripted text can be used to represent chemical formulas, such as H2O.