The <mover> MathML element is used to attach an accent or a limit over an expression. Use the following syntax: <mover> base overscript </mover>
This element's attributes include the global MathML attributes as well as the following attribute:
accentA <boolean> indicating whether the over script should be treated as an accent (i.e., drawn bigger and closer to the base expression).
<math display="block">
<mover accent="true">
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
<mo>+</mo>
<mi>z</mi>
</mrow>
<mo>&#x23DE;<!--TOP CURLY BRACKET--></mo>
</mover>
</math><munder> (Underscript)<munderover> (Underscript-overscript pair)