The MathML <msub> element is used to attach a subscript to an expression.
 It uses the following syntax: <msub> base subscript </msub>.
Attributes
- class, id, style
- Provided for use with stylesheets.
- href
- Used to set a hyperlink to a specified URI.
- mathbackground
- The background color. You can use #rgb,#rrggbband HTML color names.
- mathcolor
- The text color. You can use #rgb,#rrggbband HTML color names.
- subscriptshift
- The minimum space by which to shift the subscript below the baseline of the expression, as a length value.
Examples
Sample rendering: 
Rendering in your browser:
<math> <msub> <mi>X</mi> <mn>1</mn> </msub> </math>
Specifications
| Specification | Status | Comment | 
|---|---|---|
| MathML 3.0 The definition of 'msub' in that specification. | Recommendation | Current specification | 
| MathML 2.0 The definition of 'msub' in that specification. | Recommendation | Initial specification | 
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari | 
|---|---|---|---|---|---|
| Basic support | Not supported | 1.0 (1.7 or earlier) | Not supported | Not supported | 5.1 | 
| href | Not supported | 7.0 (7.0) | Not supported | Not supported | Not supported | 
| mathbackground | Not supported | 4.0 (2.0) | Not supported | Not supported | 5.1 | 
| mathcolor | Not supported | 4.0 (2.0) | Not supported | Not supported | 5.1 | 
| subscriptshift | Not supported | 1.0 (1.7 or earlier) | Not supported | Not supported | Not supported | 
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | 
|---|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | 1.0 (1.0) | Not supported | Not supported | Not supported | 
| href | Not supported | Not supported | 7.0 (7.0) | Not supported | Not supported | Not supported | 
| mathbackground | Not supported | Not supported | 4.0 (2.0) | Not supported | Not supported | Not supported | 
| mathcolor | Not supported | Not supported | 4.0 (2.0) | Not supported | Not supported | Not supported | 
| subscriptshift | Not supported | Not supported | 1.0 (1.0) | Not supported | Not supported | Not supported | 
Gecko-specific notes
- Starting with Gecko 26.0 (Firefox 26 / Thunderbird 26 / SeaMonkey 2.23 / Firefox OS 1.2) it is no longer possible to use <none />as a child element. The rendering has been made more consistent with equivalent configurations of<msup>and<mmultiscripts>and a bug with an incorrect applicationof thesuperscriptshiftattribute has been fixed (see bug 827713 for details).
See also
- <msup>(Superscript)
- <msubsup>(Subscript-superscript pair)
- <mmultiscripts>(Prescripts and tensor indices)