On this page there’s 3 highlights (premium only) outlining what Amazon are doing right and wrong. (Tip: use the arrows above or on your keyboard to navigate all 37 ‘Checkout: Address validator’ design examples.)
The screenshot was taken May 25, 2016 and depicts Amazon’s Address validator. In total, we’ve reviewed 48 of Amazon’s design elements. To see them all, visit the full Amazon UX case study.