If you develop for the web, one challenge you always come across is how to make the best use of screen estate across so many different screens, layouts, and resolutions. It used to be that people only browsed from their computers which had a few limited screen resolutions possible. Now that number has risen, and with the advent of mobiles and tablets, the number of possibilities has gone up even more. Not to mention landscape and portrait orientations, which complicate things further.

Viewing what a site looks like on different screens simultaneously can make things easier on developers and designers, especially when they want to check out many websites and get some ideas from what others are doing.

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