<mfrac>

Baseline 2023

Newly available

Since January 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The <mfrac> MathML element is used to display fractions. It can also be used to mark up fraction-like objects such as binomial coefficients and Legendre symbols.

Syntax

html

<mfrac>numerator denominator</mfrac>

Attributes

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

denomalign Deprecated Non-standard: The alignment of the denominator under the fraction. Possible values are: left, center (default), and right.
linethickness: A <length-percentage> indicating the thickness of the horizontal fraction line.
numalign Deprecated Non-standard: The alignment of the numerator over the fraction. Possible values are: left, center (default), and right.

Note: For the linethickness attribute, some browsers may also accept the deprecated values medium, thin and thick (whose exact interpretation is left to implementers) or legacy MathML lengths.

Examples

Simple fraction

The following MathML code should render as a fraction with numerator "a + 2" and denominator "3 − b":

html

<math display="block">
  <mfrac>
    <mrow>
      <mi>a</mi>
      <mo>+</mo>
      <mn>2</mn>
    </mrow>
    <mrow>
      <mn>3</mn>
      <mo>−</mo>
      <mi>b</mi>
    </mrow>
  </mfrac>
</math>

Fraction without bar

The following MathML code should render as a binomial coefficient:

html

<math display="block">
  <mrow>
    <mo>(</mo>
    <mfrac linethickness="0">
      <mi>n</mi>
      <mi>k</mi>
    </mfrac>
    <mo>)</mo>
  </mrow>
</math>

Technical summary

Implicit ARIA role	None

Specifications

Specification
MathML Core # fractions-mfrac

Browser compatibility

BCD tables only load in the browser