<!DOCTYPE html> <html> <head> <title>mphantom</title> <meta charset="utf-8"/> </head> <body> <!-- Test that <mphantom> has the size of its content. --> <p> <math> <mtext>LEFT</mtext> <munderover> <mphantom> <mspace width="4em" height="3em" depth="2em" mathbackground="red"/> </mphantom> <mtext>BELOW</mtext> <mtext>ABOVE</mtext> </munderover> <mtext>RIGHT</mtext> </math> </p> </body> </html>