HTML <sub> and <sup> Tags
Example
Subscript and superscript text:
<p>This text contains <sub>subscript</sub> text.</p>
<p>This text contains <sup>superscript</sup> text.</p> |
Try it yourself » |
Definition and Usage
The <sub> tag defines subscript text. Subscript text appears half a character below the baseline. Subscript text can be used for chemical formulas, like H2O.
The <sup> tag defines superscript text. Superscript text appears half a character above the baseline. Superscript text can be used for footnotes, like WWW[1].
Browser Support
The <sub> and <sup> tags are supported in all major browsers.
Differences Between HTML and XHTML
NONE
Standard Attributes
DTD indicates in which HTML 4.01/XHTML 1.0
DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
The <sub> and <sup> tags support the following standard attributes:
| Attribute |
Value |
Description |
DTD |
| class |
classname |
Specifies a classname for an element |
STF |
| dir |
rtl
ltr |
Specifies the text direction
for the content in an element |
STF |
| id |
id |
Specifies a unique id for an element |
STF |
| lang |
language_code |
Specifies a language code for the content in an element |
STF |
| style |
style_definition |
Specifies an inline style for an element |
STF |
| title |
text |
Specifies extra information about an element |
STF |
| xml:lang |
language_code |
Specifies a language code for the content in an element, in
XHTML documents |
STF |
More information about Standard Attributes.
Event Attributes
The <sub> and <sup> tags support the following event attributes:
| Attribute |
Value |
Description |
DTD |
| onclick |
script |
Script to be run on a mouse click |
STF |
| ondblclick |
script |
Script to be run on a mouse double-click |
STF |
| onmousedown |
script |
Script to be run when mouse button is pressed |
STF |
| onmousemove |
script |
Script to be run when mouse pointer moves |
STF |
| onmouseout |
script |
Script to be run when mouse pointer moves out of an
element |
STF |
| onmouseover |
script |
Script to be run when mouse pointer moves over an
element |
STF |
| onmouseup |
script |
Script to be run when mouse button is released |
STF |
| onkeydown |
script |
Script to be run when a key is pressed |
STF |
| onkeypress |
script |
Script to be run when a key is pressed and released |
STF |
| onkeyup |
script |
Script to be run when a key is released |
STF |
More information about Event Attributes.
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