Viewports come in all shapes and sizes. A recent study looked at over 120,000 viewport widths and heights from users, finding over 2,300 unique combinations. Even the most popular sizes, like iPhone and desktop displays, showed huge variation.

You never know how your site will be viewed, so focus on simplifying content to work for all. Accept that you can’t control conditions, but use limitations to get creative. The goal is to mentor browsers instead of micromanaging them, allowing flexibility so everyone has a good experience.