Web/JavaScript/Reference/Global objects/String/sub

DeprecatedThis feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The sub() method creates a  HTML element that causes a string to be displayed as subscript.

Syntax

str.sub()

Return value

A string containing a  HTML element.

Description

The sub() method embeds a string in a  element: "str".

Examples

Using sub() and sup() methods

The following example uses the sub() and sup() methods to format a string:

var superText = 'superscript';
var subText = 'subscript';

console.log('This is what a ' + superText.sup() + ' looks like.');
// "This is what a <sup>superscript</sup> looks like."

console.log('This is what a ' + subText.sub() + ' looks like.');
// "This is what a <sub>subscript</sub> looks like."

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'String.prototype.sub' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`sub` Deprecated'	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100

Legend

Full support: Full support
Deprecated. Not for use in new websites.': Deprecated. Not for use in new websites.