<mrow>

The MathML <mrow> element is used to group sub-expressions, which usually contain one or more operators with their respective operands (such as <mi> and <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 allows for more intelligent line-breaking and indentation.
• It simplifies the interpretation of the expression by automated systems such as computer algebra systems and audio renderers.

class, id, style

Provided for use with stylesheets.

displaystyle

A Boolean value specifying whether more vertical space is used for displayed equations or, if set to false, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when displaystyle is set to true. See also largeop and movablelimits on <mo>.

dir

Overall directionality of formulas. Possible values are either ltr (left to right) or rtl (right to left).

href

Used to set a hyperlink to a specified URI.

mathbackground

The background color. You can use #rgb, #rrggbb and HTML color names.

mathcolor

The text color. You can use #rgb, #rrggbb and HTML color names.

<math>

  <mrow>
    <mn> 1 </mn>
    <mo> + </mo>
    <mn> 1 </mn>
  </mrow>

  <mrow>
    <mo> ( </mo>
    <mrow>
      <mi> x </mi>
      <mo> , </mo>
      <mi> y </mi>
    </mrow>
    <mo> ) </mo>
  </mrow>

</math>

• Grouping HTML elements: <div>