Before I let you in, I gotta ask...
(Modern Chrome/Firefox, Edge, Opera, Vivaldi, Safari, phone browsers)
(Pick this if you're unsure)
(IE7+, Mozilla Suite/RetroZilla/Netscape 6.0+/Firefox 2.0+, Safari 3, Camino)
(IE6 and under, Netscape 4.0 and under, or text mode browsers like Lynx)