The best screen width to design to?
I am now designing a mobile site, my question is what is the best screen width to design and build to?
Should I use 320px x 480px?
640px x 960px?
I understand that non-retina display iPhone have a resolution of 320px x 480px however retina iPhones have twice that. Should I build my website to the retina resolution and then allow non retina displays to just scale the website down, as they do with traditional sites?
Thanks for any help clarifying the issue.