@zensaiyuki The WAI recommends tap targets have 44x44 CSS pixels; Google recommends 48x48 CSS pixels with an 8px gap (so no overlap across a 56x58 px area).
A test I like to do is to close my eyes before tapping and try to hit the region where I remember a button. If I hit the wrong button too often, something might be wrong.
A test I like to do is to close my eyes before tapping and try to hit the region where I remember a button. If I hit the wrong button too often, something might be wrong.