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HTML: <sup> tag

This HTML tutorial explains how to use the HTML element called the <sup> tag with syntax and examples.

Description

The HTML <sup> tag defines superscript text in an HTML document. For example, when dealing with an area value such as 36 ft2, the number 2 is rendered as superscript. This superscript text has a smaller font and appears with a raised baseline. This tag is also commonly referred to as the <sup> element.

Syntax

In HTML, the syntax for the <sup> tag is:

<body>
  <p>The area of the box is 36 ft<sup>2</sup>.</p>
</body>

Sample Output

Attributes

Only the Global Attributes apply to the <sup> tag. There are no attributes that are specific to the <sup> tag.

Note

  • The HTML <sup> element is found within the <body> tag.
  • The <sup> tag is used to comply with typographical standards or conventions.
  • The <sup> tag is generally used to specify exponents such as m2 and ordinal numbers such as 1st, 2nd or 3rd.

Browser Compatibility

The <sup> tag has basic support with the following browsers:

  • Chrome
  • Android
  • Firefox (Gecko)
  • Firefox Mobile (Gecko)
  • Internet Explorer (IE)
  • Edge Mobile
  • Opera
  • Opera Mobile
  • Safari (WebKit)
  • Safari Mobile

Example

We will discuss the <sup> tag below, exploring examples of how to use the <sup> tag in HTML5, HTML 4.01 Transitional, XHTML 1.0 Transitional, XHTML 1.0 Strict, and XHTML 1.1.

  • HTML5
  • HTML4
  • XHTML

HTML5 Document

If you created a new web page in HTML5, your <sup> tag might look like this:

<!doctype html>
<html>

<head>
<meta charset="UTF-8">
<title>HTML5 Example by www.techonthenet.com</title>
</head>

<body>
<h1>Heading 1</h1>
<p>TechOnTheNet.com was the 1<sup>st</sup> to offer easy to understand tutorials.</p>
</body>

</html>

In this HTML5 Document example, we have defined the "st" in 1st as superscript text using a <sup> tag. This renders the letters "st" in 1st as smaller text that is a half of a character in height higher than the other text.

HTML 4.01 Transitional Document

If you created a new web page in HTML 4.01 Transitional, your <sup> tag might look like this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>HTML 4.01 Transitional Example by www.techonthenet.com</title>
</head>

<body>
<h1>Heading 1</h1>
<p>TechOnTheNet.com was the 1<sup>st</sup> to offer easy to understand tutorials.</p>
</body>

</html>

In this HTML 4.01 Transitional Document example, we have defined the "st" in 1st as superscript text using a <sup> tag. This renders the letters "st" in 1st as smaller text that is a half of a character in height higher than the other text.

XHTML 1.0 Transitional Document

If you created a new web page in XHTML 1.0 Transitional, your <sup> tag might look like this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>XHMTL 1.0 Transitional Example by www.techonthenet.com</title>
</head>

<body>
<h1>Heading 1</h1>
<p>TechOnTheNet.com was the 1<sup>st</sup> to offer easy to understand tutorials.</p>
</body>

</html>

In this XHTML 1.0 Transitional Document example, we have defined the "st" in 1st as superscript text using a <sup> tag. This renders the letters "st" in 1st as smaller text that is a half of a character in height higher than the other text.

XHTML 1.0 Strict Document

If you created a new web page in XHTML 1.0 Strict, your <sup> tag might look like this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>XHTML 1.0 Strict Example by www.techonthenet.com</title>
</head>

<body>
<h1>Heading 1</h1>
<p>TechOnTheNet.com was the 1<sup>st</sup> to offer easy to understand tutorials.</p>
</body>

</html>

In this XHTML 1.0 Strict Document example, we have defined the "st" in 1st as superscript text using a <sup> tag. This renders the letters "st" in 1st as smaller text that is a half of a character in height higher than the other text.

XHTML 1.1 Document

If you created a new web page in XHTML 1.1, your <sup> tag might look like this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>XHTML 1.1 Example by www.techonthenet.com</title>
</head>

<body>
<h1>Heading 1</h1>
<p>TechOnTheNet.com was the 1<sup>st</sup> to offer easy to understand tutorials.</p>
</body>

</html>

In this XHTML 1.1 Document example, we have defined the "st" in 1st as superscript text using a <sup> tag. This renders the letters "st" in 1st as smaller text that is a half of a character in height higher than the other text.

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