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<!DOCTYPE html>
<meta charset="utf-8">
<title>mathsize on a (reference)</title>
<a style="font-size: 200%;">
<mfrac>
<mi>x</mi>
<mi>y</mi>
</mfrac>
</a>
</math>
<a href="about:blank" style="font-size: 200%;">
<mfrac>
<mi>x</mi>
<mi>y</mi>
</mfrac>
</a>
</math>