<munder>

The MathML <munder> element is used to attach an accent or a limit under an expression. It uses the following syntax: <munder> base underscript </munder>

accentunder

If true, the element is an accent, which is drawn closer to the base expression. If false (default value), the element is a limit under the base expression.

align

The alignment of the underscript. Possible values are: left, center, and right. This attribute is deprecated and will be removed in the future. Use CSS text-align instead.

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 movablelimits on <mo>.

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.

Sample rendering:

Rendering in your browser: $\underbrace{x+y+z}$

<math>

<munder accentunder="true">
  <mrow>
    <mi> x </mi>
    <mo> + </mo>
    <mi> y </mi>
    <mo> + </mo>
    <mi> z </mi>
  </mrow>
  <mo> &#x23DF; <!--BOTTOM CURLY BRACKET--> </mo>
</munder>

</math>

• <mover> (Overscript)
• <munderover> (Underscript-overscript pair)