box-shadow in safari

For some reason jquery-mobile flags <html> as ui-mobile-nosupport-boxshadow in safari browsers. Had very hard time to figure it out as i never debugged safari before. Anyone had same issue? I experience this in Safari 4.0.4 (win7) and iBBDemo2 iPhone and iPad simulator (win7) . Could this be a platform issue that doesn't affect the real thing i have no way to know. I'm using jQ mobile Alpha 4