<!DOCTYPE html>
<html>
  <head>
    <title>Stretchy munderover</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
  </head>
  <body>
    <!-- See bug 687807 -->
    <math>
      <munderover>
        <mtext>AAAAAA</mtext>
        <mo stretchy="true">&#x2192;</mo>
        <mtext>BBBBBB</mtext>
        </munderover>
      </math>
  </body>
</html>