Fitts's Law states that the time to acquire a target is a function of the distance to and size of the target.
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Why are "Floating Action Buttons" (FAB) usually at the bottom?
Because that's where the user's thumb is! By making the most important actions large and close to the natural resting position of the finger/cursor, you make the product feel "faster" and easier to use.
Knowledge Challenge
Mastered Fitts's Law (Targeting and Size)? Now try to guess the related 6-letter word!
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