title: Check that specific font is installed or not?
body: <p>I create a RTL website in Urdu language. Its also required "Alvi Nastaleeq" Urdu font to view correctly. How to check that visitor have such font installed or not? If the font is not fount, a message appear rather then website that says "This is website is completely compiled in Urdu. To see it please install Alvi Nastaleeq Font". How to do that?</p>