{{MathMLRef}} 

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 {{deprecated_inline}}  {{Non-standard_Inline}} 
  • : A {{cssxref("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

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

{{EmbedLiveSample('Examples')}} 

Technical summary

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• {{ MathMLElement("msup") }}  (Superscript)
• {{ MathMLElement("msubsup") }}  (Subscript-superscript pair)
• {{ MathMLElement("mmultiscripts") }}  (Prescripts and tensor indices)