The data URI scheme is defined in RFC 2397. See: http://tools.ietf.org/html/rfc2397 http://tools.ietf.org/html/rfc2397 Entitled as 'The "data" URL scheme'. E

The data URI scheme is defined in RFC 2397. See: http://tools.ietf.org/html/rfc2397 http://tools.ietf.org/html/rfc2397 Entitled as 'The "data" URL scheme'. Either way, it doesn't matter, because the OP has provided such limited details as to why this is required knowledge that the question is as irrelevant as the accepted answer.