<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">  <mfenced>    <mrow>      <mtable>        <mtr>          <mtd>            <maction actiontype="tooltip">              <mrow>                <mn>12</mn>
                <mi>x</mi>
              </mrow>               <mtext>First row, first column</mtext>             </maction>           </mtd>           <mtd>            <maction actiontype="tooltip">              <mn>0</mn>               <mtext>First row, last column</mtext>             </maction>           </mtd>         </mtr>         <mtr>          <mtd>            <maction actiontype="tooltip">              <mn>0</mn>               <mtext>Last row, first column</mtext>             </maction>           </mtd>           <mtd>            <maction actiontype="tooltip">              <mn>117</mn>               <mtext>Last row, last column</mtext>             </maction>           </mtd>         </mtr>       </mtable>     </mrow>   </mfenced> </math>