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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

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

Syntax

str.sub()

Return value

A string containing a <sub> HTML element.

Description

The sub() method embeds a string in a <sub> tag: "<sub>str</sub>".

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 2017 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 compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) 1.0 (1.0) (Yes) (Yes) (Yes)

See also

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