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Showing content from https://webplatform.github.io/docs/mathml/elements/maction below:

maction · WebPlatform Docs

The MathML maction element provides a possibility to bind actions to (sub-) expressions. The action itself is specified by the actiontype attribute, which accepts several values. To specify which child elements are addressed by the action, you can make use of the selection attribute.

DOM Interface

mathml

This example demonstrates a simple usage of maction:

<math>

<maction actiontype="toggle">

  <mfrac>
    <mn>6</mn>
    <mn>8</mn>
  </mfrac>

  <mfrac>
    <mrow>
      <mn>3</mn>
      <mo>⋅</mo>
      <mn>2</mn>
    </mrow>
    <mrow>
      <mn>4</mn>
      <mo>⋅</mo>
      <mn>2</mn>
    </mrow>
  </mfrac>

  <mfrac>
    <mn>3</mn>
    <mn>4</mn>
  </mfrac>

</maction>

</math>

MathML 3.0

W3C Recommendation

actiontype

The action which specifies what happens for this element. Possible values are:

• statusline: If there is a click on the expression or the reader moves the pointer over it, the message is sent to the browser’s status line. The syntax is: <maction actiontype="statusline"> expression message </maction>.

• toggle: When there is a click on the subexpression, the rendering alternates the display of selected subexpressions. Therefore each click increments the selection value.

The syntax is: <maction actiontype="toggle" selection="positive-integer" > expression1 expression2 expressionN </maction>.

• tooltip: When the pointer moves over the expression, a tooltip box with a message is displayed near the expression.

The syntax is: <maction actiontype="tooltip"> expression message </maction>.
selection

The child element which is addressed by the action. The default value is 1 which is the first child element.

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