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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()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. |
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) |