The Minimum Touch Target Size on iOS vs. Android
A toolbar icon is drawn at a visually reasonable 20×20px with no padding around it.
Per the platform guidelines this subject cites, what are the actual minimum tappable-area sizes on iOS and Android/Material?
The correct answer is "44×44pt on iOS, 48×48dp on Material."
This subject cites the exact, checkable numbers: Apple's Human Interface Guidelines set a minimum touch target of 44×44pt; Google's Material Design sets 48×48dp. Both describe the same underlying idea in slightly different resolution-independent units, and both trace directly to Fitts's Law — a fingertip is a far less precise pointing instrument than a mouse cursor, so acquisition time and error rate both climb below these thresholds. A 20×20px icon with no padding is one of the most common real violations, because the glyph looks fine while the tappable area around it doesn't hit the minimum.
The distractors misstate the numbers: 20×20px is the visually-drawn icon size in the scenario, not the actual required hit-target size — that's precisely the gap the question is testing; 60×60pt / 40×40dp inverts and inflates the real figures; and touch targets do have a stated minimum size, not just a spacing requirement — spacing between adjacent targets matters in addition to, not instead of, the size minimum.
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