The test results on browser compatibility for various features in the Cloud for Customer solution are published in the product availability matrix for 1511. This Excel document is referenced as an attachment - 1511_C4C_PAM.xlsx in the SAP Note 2194030.Note that though the contents of this excel are based on extensive testing, they are not comprehensive enough to cover all the features in the solution.
Also, this document is only a consulting support document and is intended to help with issues pertaining to browsers. It is not part of any standard documentation for SAP Cloud for Customer. Any new issues pertaining to browsers can continue to be be reported via tickets. For standard software and hardware requirements for Cloud for Customer, see System and Software Requirements.