" style="background: blue"/>
      </mroot>
    </math>
  </p>
  <hr/>
  <p>
    <math display="block"
          style="font-family: displaystyleverticalgap7000-rulethickness1000;">
      <msqrt style="background: green" id="radical0021">
        <mspace id="base0021" width="3em" height="1em" style="background: blue"/>
      </msqrt>
      <mroot style="background: green" id="radical0022">
        <mspace id="base0022" width="3em" height="1em" style="background: blue"/>
        <mspace width="3em" height="1