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   <div>MathML fraction test cases</div>
   <math display="block"><mfrac><mi>a</mi><mi>b</mi></mfrac></math>
   <math display="block" alttext="This is the alttext for a/b"><semantics><mfrac><mi>a</mi><mi>b</mi></mfrac><annotation encoding="application/x-tex">\frac a b</annotation></semantics></math>
   <math display="block"><mfrac linethickness="0px"><mi>a</mi><mi>b</mi></mfrac></math>
   <div>End of test</div>
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