W3C MathML TestSuite: Version 3: Test-case mfracBheight17

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\begin{matrix} taller num & x^{2} + {\frac{h}{x}}^{2} + {(\frac{h}{x})}^{2} \\ taller denom & x^{2} + {\frac{x}{y}}^{2} + {(\frac{x}{y})}^{2} \end{matrix}