<!DOCTYPE html> <html> <head> <title>mfrac numalign</title> </head> <body> <div style="position: absolute;"> <math xmlns="http://www.w3.org/1998/Math/MathML"> <mfrac numalign="left" linethickness="0"> <mspace width="50px" height="20px" mathbackground="red"></mspace> <mspace width="100px" height="20px" mathbackground="red"></mspace> </mfrac> </math> </div> </body> </html>