index.md

---

title: <mrow>
slug: Web/MathML/Element/mrow
browser-compat: mathml.elements.mrow

---

{{MathMLRef}}

The <mrow> MathML element is used to group sub-expressions, which usually contain one or more operators with their respective operands (such as {{ MathMLElement("mi") }} and {{ MathMLElement("mn") }}). This element renders as a horizontal row containing its arguments.

When writing a MathML expression, you should group elements within an <mrow> in the same way as they are grouped in the mathematical interpretation of the expression. Proper grouping helps the rendering of the expression in several ways:

• It can improve the display by possibly affecting spacing.

• It simplifies the interpretation of the expression by automated systems such as computer algebra systems and audio renderers.

Attributes

This element accepts the global MathML attributes.

Examples

<math display="block">
  <mfrac>
    <mrow>
      <!-- numerator content grouped in one mrow -->
      <mn>1</mn>
      <mo>+</mo>
      <mi>K</mi>
    </mrow>
    <mrow>
      <!-- denominator content grouped in one mrow -->
      <mn>3</mn>
      <mrow>
        <!-- fenced expression grouped in one mrow -->
        <mo>(</mo>
        <mrow>
          <!-- fenced content grouped in one mrow -->
          <mi>x</mi>
          <mo>+</mo>
          <mi>y</mi>
        </mrow>
        <mo>)</mo>
      </mrow>
    </mrow>
  </mfrac>
</math>

{{ EmbedLiveSample('mrow_example', 700, 200, "", "") }}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Grouping HTML elements: {{ HTMLElement("div") }}