I've added some custom fonts to my iOS app and tried applying them using Freestyle CSS like
label {
font-family : "Niconne-Regular";
color : #446620;
}
but it did not work (the colour attribute did get applied). I was able to set the new font using UIFont fontWithName, so it's only Freestyle which could not use the new font (also, the same CSS worked with a built-in font, like "Courier").