<munder>
        
        
          
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      This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2023.
The <munder> MathML element is used to attach an accent or a limit under an expression. It uses the following syntax: <munder> base underscript </munder>
Attributes
This element's attributes include the global MathML attributes as well as the following attribute:
- accentunder
- 
A <boolean>indicating whether the under script should be treated as an accent (i.e., drawn bigger and closer to the base expression).
Examples
html
<math display="block">
  <munder accentunder="true">
    <mrow>
      <mi>x</mi>
      <mo>+</mo>
      <mi>y</mi>
      <mo>+</mo>
      <mi>z</mi>
    </mrow>
    <mo>⏟<!--BOTTOM CURLY BRACKET--></mo>
  </munder>
</math>
Technical summary
| Implicit ARIA role | None | 
|---|
Specifications
| Specification | 
|---|
| MathML Core> # underscripts-and-overscripts-munder-mover-munderover> | 
Browser compatibility
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See also
- <mover>(Overscript)
- <munderover>(Underscript-overscript pair)