W3C MathML TestSuite: Version 3: Test-case stretchHoriz1

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\begin{matrix} Stetching in base & Stretching in script \\ no mrows & \overset{maps to}{\to} & \vec{maps to} \\ all in row & \overset{maps to}{\to} & \vec{maps to} \\ op in row & \overset{maps to}{\to} & \vec{maps to} \\ text in row & \overset{maps to}{\to} & \vec{maps to} \end{matrix}