Describe how task switcher integration works on various platforms

[marcoscaceres]

Elsewhere, Rob Manson wrote:

..the common experience especially on iOS is that even when you background
an installed app and then foreground it again it reloads the entire
state. This effectively breaks the UX and makes this mode almost
unusable. It's definitely possible to use localStorage, etc. to work
around this but the UX is horrible. Allowing installed apps to persist
their resources and loaded state across background/foreground (and
ideally even launches) would be a massive step forward. Perhaps naming
this a "First use page" would help clarify this focus?