I prefer 3-button navigation, but it seems most of the web has decided that gesture-based navigation has won, and it's an awful experience sometimes. They assume you will always swipe down to close popup modals like full-size images, so pressing back will instead navigate out of the page. And half the time, navigating forward puts you right back on top of the modal again!

It breaks the intuition that one tap == one piece of state on the navigation stack.

Go to previous (web)page if web/file browser

Keeps walking the tree upwards.

If i switch to my browser and hit back what happens : I go back to my previous app ? I go back in my browser page cache history ? I go back to the page that opened that web page i'm looking at ? something else ?

also mixing Back and Up is just wrong. I've had arguments with people that don't understand the difference.

brilliant. when i last used an android google apps were the worst for abusing the back button. maybe it's changed since then. sometimes it went up. sometimes previous. sometimes quit.