<!DOCTYPE html>
<html>
   <head>
     <title>accent / accentunder</title>
     <meta charset="utf-8"/>
     <style>
       * {
         font-size: 12pt;
       }
     </style>
   </head>
   <body>
    <math>
      <munder>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="ra1">O</mo>
      </munder>
    </math>
    <math>
      <mover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="ra2">O</mo>
      </mover>
    </math>
    <math>
      <munderover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="ra3">O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    <math>
      <munderover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo id="ra4">O</mo>
      </munderover>
    </math>
    <math>
      <mover id="ra5">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
      </mover>
    </math>
    <math>
      <munderover id="ra6">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    <math>
      <munder id="rau1">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
      </munder>
    </math>
    <math>
      <munderover id="rau2">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    <hr/>
    <math>
      <munder>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="aa1" accent="true">O</mo>
      </munder>
    </math>
    <math>
      <mover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="aa2" accent="true">O</mo>
      </mover>
    </math>
    <math>
      <munderover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo id="aa3" accent="true">O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    <math>
      <munderover>
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo id="aa4" accent="true">O</mo>
      </munderover>
    </math>
    <math>
      <mover id="aa5" accent="true">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
      </mover>
    </math>
    <math>
      <munderover id="aa6" accent="true">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    <math>
      <munder id="aau1" accentunder="true">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
      </munder>
    </math>
    <math>
      <munderover id="aau2" accentunder="true">
        <mspace width="1em" height="3em" mathbackground="red"/>
        <mo>O</mo>
        <mo>O</mo>
      </munderover>
    </math>
    </body>
</html>
