<sub> element defines a span of text that should be displayed, for typographic reasons, lower, and often smaller, than the main span of text.
|Content categories||Flow content and phrasing content|
|Permitted content||Phrasing content|
|Tag omission||None, both the starting and ending tag are mandatory.|
|Permitted parents||Any element that can contain phrasing content|
|Permitted ARIA roles||Any|
This element only includes the global attributes.
- This element should be used for typographical reasons only, i.e. changing the position of the text changing its meaning like in mathematical (like t2, though the use of a MathML formula should be considered) or chemical formulas (like
- This element must not be used for styling purpose like the styling of the product name Latex. In that case CSS style should be used: the
vertical-alignproperty with the
subvalue will achieve the same effect.
<p>The chemical formula of water: H<sub>2</sub>O</p>
The chemical formula of water: H2O
|WHATWG HTML Living Standard
The definition of '<sub> and <sup>' in that specification.
The definition of '<sub> and <sup>;' in that specification.
<sup>HTML element that produces superscript. Note that you cannot use them both at the same time and you need to use MathML to produce both a superscript and a subscript next to the chemical symbol of an element, representing its atomic number and its nuclear number.