menclose-cancellation1

Example cancellation.

W3C sample	WIRIS
	$$\frac{\cancel{\left(a-3\right)}-18a}{\cancel{\left(a-3\right)}\left(a+3\right)}$$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <semantics>
    <mfrac>
      <mrow>
        <mrow>
          <menclose notation="updiagonalstrike">
            <mo>(</mo>
            <mrow>
              <mi>a</mi>
              <mo>&#x2212;</mo>
              <mn>3</mn>
            </mrow>
            <mo>)</mo>
          </menclose>
        </mrow>
        <mo>&#x2212;</mo>
        <mn>18</mn>
        <mi>a</mi>
      </mrow>
      <mrow>
        <mrow>
          <menclose notation="updiagonalstrike">
            <mo>(</mo>
            <mrow>
              <mi>a</mi>
              <mo>&#x2212;</mo>
              <mn>3</mn>
            </mrow>
            <mo>)</mo>
          </menclose>
        </mrow>
        <mrow>
          <mo>(</mo>
          <mrow>
            <mi>a</mi>
            <mo>+</mo>
            <mn>3</mn>
          </mrow>
          <mo>)</mo>
        </mrow>
      </mrow>
    </mfrac>
  </semantics>
</math>

Author: Eliot Kimber, reallysi.com