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    <div>This test passes if it does not crash.</div>
    <math><mfrac><mo>|</mo><mn>1</mn></mfrac></math>
    <math><munder><mo>|</mo><mn>1</mn></munder></math>
    <math><mover><mo>|</mo><mn>1</mn></mover></math>
    <math><munderover><mo>|</mo><mn>1</mn><mn>2</mn></munderover></math>
    <math><msub><mo>|</mo><mn>1</mn></msub></math>
    <math><msup><mo>|</mo><mn>1</mn></msup></math>
    <math><msubsup><mo>|</mo><mn>1</mn><mn>2</mn></msubsup></math>
    <math><mmultiscripts><mo>|</mo><mn>1</mn><mn>2</mn><mprescripts/><mn>3</mn><mn>4</mn></mmultiscripts></math>
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