<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">  <mi mathvariant="normal">_ baseline _</mi>   <mo>=</mo>   <munder>    <mi mathvariant="normal">_ baseline _</mi>     <mphantom>      <mi mathvariant="normal">fail</mi>
    </mphantom>   </munder> </math>