Resolutions and display width

The numbers clearly show that monitor sizes and resolutions are getting bigger. The most common interpretation of that is more and more people have bigger displays. But an equally valid interpretation of the numbers is the range of displays is bigger than ever. It’s a subtle but important distinction. One interpretation focuses solely on the size of the highest numbers; the other interpretation focuses on the range of all the numbers.

Never forget that: screen width is no indication of the available width within the browser.