HTML <sub> Tag
Topic: HTML5 Tags ReferencePrev|Next
Description
The <sub> (short for subscript) tag renders enclosed text as subscript.
Subscript text appears half a character's height below the baseline, and is most often used in mathematical (e.g. y = logax) or chemical formulas, like H2O.
The following table summarizes the usages context and the version history of this tag.
| Placement: | Inline |
|---|---|
| Content: | Inline and text |
| Start/End Tag: | Start tag: required, End tag: required |
| Version: | HTML 3.2, 4, 4.01, 5 |
Usage Notes
- The
<sub>tag should be used for typographical reasons only. - This tag must not be used for styling purpose like changing the vertical position of the text. In that case CSS should be used instead: the
vertical-alignproperty with thesubvalue will achieve the same effect.
Syntax
The basic syntax of the <sub> tag is given with:
HTML / XHTML: <sub> ... </sub>
The example below shows the <sub> tag in action.
Example
Try this code »<p>The chemical formula of Water is: H<sub>2</sub>O</p>
<p>The chemical formula of Carbon Dioxide is: CO<sub>2</sub></p>Tag-Specific Attributes
The <sub> tag doesn't have any specific attribute.
Global Attributes
Like all other HTML tags, the <sub> tag supports the global attributes in HTML5.
Event Attributes
The <sub> tag also supports the event attributes in HTML5.
Browser Compatibility
The <sub> tag is supported in all major modern browsers.
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Basic Support—
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Further Reading
See tutorial on: HTML Text Formatting.
Related tag: <sup>.
