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. 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 <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) |