Floating Action Button, or, in short, FAB, is one of the unique UI element in Material Design for primary/promoted action for a particular screen. Since it is a frequently accessed UI element in a given screen, I think it’s important to make the FAB right in every details. However, there are a number of apps doesn’t have the right FAB as specced in the Material Design Guideline, which also included some of the Google apps (I know!).

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