Below Mashup code works fine in FireFox. In Chrome, it displays "Browser cookies must be enabled for PRPC Internet Application Composer to function." and in IE, it doesn't render at all. Using Pega 7.2.2.
I don't think HFix-32936 is going to fix this because: "Pega Platform from version 7.2.2 and later provides the P3P header" (link to source below) I think the way to get this working for IE is to try to get whomever is in charge of group policy limiting your access, to enable cookies in IE 11