HTML <sup> tag

The <sup> tag is used to define the superscript text, which appears half a character above the regular line and is rendered smaller than the rest of the text. The tag is usually used to define footnotes and formulas.

The <sub> tag is used to define the subscript.


The <sup> tag comes in pairs; the content is written between the opening (<sup>) and the closing (</sup>) tags.


<!DOCTYPE html>
    <title>Title of the document</title>
    <p>E = mc<sup>2</sup>, where E is the energy of the object, m is the weight, c is the light speed in vacuum. </p>



The <sup> tag supports Global attributes and the Event Attributes.

How to style <sup> tag

Common properties to alter the visual weight/emphasis/size of text in <sup> tag:?

  • CSS font-style property sets the style of the font. normal | italic | oblique | initial | inherit
  • CSS font-family property specifies a prioritized list of one or more font family names and/or generic family names for the selected element.
  • CSS font-size property sets the size of the font.
  • CSS font-weight property defines whether the font should be bold or thick. CSS text-transform Property controls text case and capitalization.
  • CSS text-decoration property specifies the decoration added to text, and is a shorthand property for text-decoration-line, text-decoration-color, text-decoration-style

Coloring text in <sup> tag:

  • CSS color property describes the color of the text content and text decorations
  • CSS background-color property sets the background color of an element.

Text layout styles for <sup> tag:

  • CSS text-indent property specifies the indentation of the first line in a text block.
  • CSS text-overflow property specifies how overflowed content that is not displayed should be signaled to the user.
  • CSS white-space property specifies how white-space inside an element is handled.
  • CSS word-break property specifies where the lines should be broken.

Other properties worth looking at for <sup> tag

Browser support

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