This might help as well.... It allows you to call up the display in Chrome on your desktop so that it has the same properties as the Official Raspberry 7" Touch Display.
That way your Dev Testing environment on your PC shows you how it will appear on the 7" Touch Display when you deploy it (useful for me as some of my Raspberry Pis are physically located in other areas away from my office and I don't want to always have to walk over to them to see the effect of Dashboard changes).