So how big is the screen?
When you are testing a web site on different devices (phones, tablets, laptops and PCs), it can get a bit confusing. How big is the viewport? – the actual bit of the screen that the user sees with your web site in it.
It works best as a standalone page – so here it is: Viewport Size.
NEW: If you find this useful, you might want to look at our Interactive Color Chart too!