The "sub" Element


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Use "sub" to markup subscript. Subscript text is rendered below and immediately to one side of another character. Use "sub" to convey a specific meaning; don't use it solely for presentation's sake.

Attributes for "sub"
TypeAttribute List
'Standard' Attributes(none)


  • Consider MathML for mathematical expressions with subscripts and superscripts.

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Accessibility Information & Tips

  • Use semantic markup elements like "em", "strong", "cite", "blockquote", "q", "quote", "sub", and "sup" when appropriate. Use "em" and "strong" to indicate structural emphasis, use "blockquote" for long quotations which may require paragraph breaks, use "q" for short inline quotations, and use "sub" and "sup" for subscripts and superscripts. Visit for more information.

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