All vendors have different sets of rules and guidelines regarding the ideal size of targets on small screen devices. Some of them refer to these sizes in pixels, others in points, and others in units such as inches, millimeters, or centimeters.
Regardless of the units these vendors use, they all agree on one basic concept: make your target size big enough to avoid accidental taps. This goes in hand with Fitts's law, which states that the smaller the target, the longer the user will take to reach it.
Obviously, as web designers, we have to be mindful of what large means in the context of our designs, so we need to balance the target size recommendations with good design principles. Our aim is that the messages should reach the users and they should be able to comfortably use our interfaces.
One thing to keep in mind is that the guidelines for target sizes for RWD are mostly based on mobile apps design patterns. Let's get right to it.
The average width of an...