<!DOCTYPE html> <html> <head> <title>mspace</title> </head> <body> <math style="position: absolute; top: 0; left: 0; margin: 0; padding: 0;"> <mspace width="50px" height="3em" depth="3em" mathbackground="red"/> <mspace width="40px" height="1em" depth="2em" mathbackground="green"/> <mspace width="30px" height="2em" depth="1em" mathbackground="blue"/> </math> </body> </html>