X11 doesn't have native controls. The closest would be motif, or Xaw, but nobody sane uses those. GTK and Qt are both equally "native". Chrome uses its own GTK-

X11 doesn't have native controls. The closest would be motif, or Xaw, but nobody sane uses those. GTK and Qt are both equally "native". Chrome uses its own GTK-derived UI lib, IIRC . As long as OP's ui implements accessibility and follows the desktop's settings as close as feasible, I see no problem.