<msub>

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2023.

* Some parts of this feature may have varying levels of support.

See full compatibility

The <msub> MathML element is used to attach a subscript to an expression.

It uses the following syntax: <msub> base subscript </msub>.

Attributes

This element's attributes include the global MathML attributes as well as the following deprecated attribute:

subscriptshift: A <length-percentage> indicating the minimum amount to shift the baseline of the subscript down.

Note: For the subscriptshift attribute, some browsers may also accept legacy MathML lengths.

Examples

html

<math display="block">
  <msub>
    <mi>X</mi>
    <mn>1</mn>
  </msub>
</math>

Technical summary

Implicit ARIA role	None

Specifications

Specification
MathML Core # subscripts-and-superscripts-msub-msup-msubsup

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`msub`	Chrome – Full support Chrome 109 (Release date: 2023-01-10) footnote Full support	Edge – Full support Edge 109 (Release date: 2023-01-12) footnote Full support	Firefox – Full support Firefox 1 (Release date: 2004-11-09) footnote Full support	Opera – Full support Opera 95 (Release date: 2023-02-01) footnote Full support	Safari – Full support Safari 6 (Release date: 2012-07-25) footnote Full support	Chrome Android – Full support Chrome Android 109 (Release date: 2023-01-10) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 74 (Release date: 2023-03-13) footnote Full support	Safari on iOS – Full support Safari on iOS 6 (Release date: 2012-09-10) footnote Full support	Samsung Internet – Full support Samsung Internet 21 (Release date: 2023-05-19) footnote Full support	WebView Android – Full support WebView Android 109 (Release date: 2023-01-10) footnote Full support	WebView on iOS – Full support WebView on iOS 6 (Release date: 2012-09-10) footnote Full support
`subscriptshift` Deprecated Non-standard	Chrome – No support Chrome footnote No support	Edge – No support Edge footnote No support	Firefox – No support Firefox 1 – 82 (Release date: 2004-11-09) footnote Removed in 83 and later	Opera – No support Opera footnote No support	Safari – Full support Safari 7 (Release date: 2013-10-22) footnote Full support	Chrome Android – No support Chrome Android footnote No support	Firefox for Android – No support Firefox for Android 4 – 82 (Release date: 2011-03-29) footnote Removed in 83 and later	Opera Android – No support Opera Android footnote No support	Safari on iOS – Full support Safari on iOS 7 (Release date: 2013-09-18) footnote Full support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – No support WebView Android footnote No support	WebView on iOS – Full support WebView on iOS 7 (Release date: 2013-09-18) footnote Full support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: Non-standard. Check cross-browser support before using.
: Deprecated. Not for use in new websites.