vendor/bundle/ruby/2.4.0/gems/kramdown-1.14.0/test/testcases/block/15_math/mathjaxnode_semantics.html.19

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <semantics>
    <mrow>
      <mi>f</mi>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo>=</mo>
      <mi>a</mi>
      <mrow class="MJX-TeXAtom-ORD">
        <msup>
          <mi>x</mi>
          <mn>3</mn>
        </msup>
      </mrow>
      <mo>+</mo>
      <mi>b</mi>
      <mrow class="MJX-TeXAtom-ORD">
        <msup>
          <mi>x</mi>
          <mn>2</mn>
        </msup>
      </mrow>
      <mo>+</mo>
      <mi>c</mi>
      <mi>x</mi>
      <mo>+</mo>
      <mi>d</mi>
    </mrow>
    <annotation encoding="application/x-tex">f(x) = a{x^3} + b{x^2} + cx + d</annotation>
  </semantics>
</math>