Image:

Your browser's rendering:

$\begin{array}{c}A+B+C+\colorbox[rgb]{1,1,1}{$D+E$}+F+G+H+I\\ A+B+C+D+E+F+G+H+I\end{array}$

Source Code:

    <math> 
      <mtable> 
        <mtr> 
          <mtd> 
            <mi>A</mi> 
            <mo color='black'>+</mo> 
            <mi color='GREEN'>B</mi> 
            <mo color='Silver'>+</mo> 
            <mi color='Lime'>C</mi> 
            <mo color='Gray'>+</mo> 
            <mstyle background='#fff'> 
              <mrow> 
                <mi color='OLIVE'>D</mi> 
                <mo color='white'>+</mo> 
                <mi color='Yellow'>E</mi> 
              </mrow> 
            </mstyle> 
            <mo color='Maroon'>+</mo> 
            <mi color='Navy'>F</mi> 
            <mo color='Red'>+</mo> 
            <mi color='Blue'>G</mi> 
            <mo color='Purple'>+</mo> 
            <mi color='Teal'>H</mi> 
            <mo color='Fuchsia'>+</mo> 
            <mi color='Aqua'>I</mi> 
          </mtd> 
        </mtr> 
        <mtr> 
          <mtd> 
            <mi>A</mi> 
            <mo mathcolor='black'>+</mo> 
            <mi mathcolor='GREEN'>B</mi> 
            <mo mathcolor='Silver'>+</mo> 
            <mi mathcolor='Lime'>C</mi> 
            <mo mathcolor='Gray'>+</mo> 
            <mstyle mathbackground='#fff'> 
              <mrow> 
                <mi mathcolor='OLIVE'>D</mi> 
                <mo mathcolor='white'>+</mo> 
                <mi mathcolor='Yellow'>E</mi> 
              </mrow> 
            </mstyle> 
            <mo mathcolor='Maroon'>+</mo> 
            <mi mathcolor='Navy'>F</mi> 
            <mo mathcolor='Red'>+</mo> 
            <mi mathcolor='Blue'>G</mi> 
            <mo mathcolor='Purple'>+</mo> 
            <mi mathcolor='Teal'>H</mi> 
            <mo mathcolor='Fuchsia'>+</mo> 
            <mi mathcolor='Aqua'>I</mi> 
          </mtd> 
        </mtr> 
      </mtable> 
    </math>