One of the cool enhancements in iOS 6 Safari is its broader support for standard HTML elements, including a regular HTML input element used on literally all sites requiring media uploading capability.
This support for media uploads lets Safari understand the standard Upload button that invokes a file picker on your desktop and replace it with standard iOS media picker.
Up until now, you could only test this on certain web sites, like the desktop Facebook interface in mobile Safari. Today, Twitter enabled on its mobile site photo uploads from a browser on iOS 6 and Android Ice Cream Sandwich devices, here's how it works...