W3cubDocs

string.sub

Deprecated
This 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  tag: "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	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.sub' in that specification.	Standard	Initial definition. Implemented in JavaScript 1.0. Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.
ECMAScript Latest Draft (ECMA-262) The definition of 'String.prototype.sub' in that specification.	Draft	Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	Yes	1	Yes	Yes	Yes

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	Yes	4	Yes	Yes	Yes

	Server
	Node.js
Basic support	Yes