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Fitts's Law is a well-established human-computer interaction principle: the time to accurately click a target depends on its size and distance from the starting point.
The Practical Takeaway
Larger, closer targets are faster and easier to click accurately than small, distant ones — a genuinely useful rule when deciding how big to make a button.
Applying It to Web Design
Important, frequently used buttons should be sized generously and positioned where users naturally expect them, not shrunk down to save minor visual space.
Mobile Amplifies This
On touchscreens, where the "cursor" is an imprecise fingertip rather than a precise mouse pointer, Fitts's Law implications matter even more for comfortable, error-free interaction.
