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CSS validator seems to completely miss knowledge about handling stuff after "background...url(data:image/gif;base64..." in this example: body { direction: ltr; margin-top: 0px; padding-top: 20px; background: #36393D url(data:image/gif;base64,R0lGODlhAQDIANUAADY5PR8hJB8iJScqLSQnKiIlKCEjJiMmKSAiJTM2OiEkJh4hJCgrLi0wNCYpLCotMCkrLyYoKywvMyIkJyksLyMlKC0wMystMSotMS4xNCQmKjAzNi4wNCUnKycpLSksMDEzNyYpKzAyNisuMSUoKyIkKDAzNzE0OCMlKSwvMjE0Ny4xNSEkJy0vMyAiJi8yNiosMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAAAAAAALAAAAAABAMgAAAZqwIVwESgai4KkUoBoNl2GaFRBVbAm2FJhy614UYdwGKDREM7oTocUaYcccIfHM6jbAXiGngHpU/4fHzAPhA8YGBcXI3iMKRKPLRYWDZQNHBwZGSuMnIwvIhsbJiAqJ52nqHgJqwmprq+MQQA7) repeat-x; font-family: Arial, Helvetica, sans-serif; font-size: 13px; color: #D1E9A3; }
Should work if the data URI is quoted url("data...")