Changing Font-Size based on specific Font thru javascript

Not exactly what you asked for, but you can kind of “make sure” the user has the desired font through the @font-face css3 rule.

According to caniuse.com about 95% of global users can use that css property, so it’s a good trade-off.

Different browsers use different font formats however, so you’ll need to use http://www.fontsquirrel.com/fontface/generator to generate all your required fonts. The site will also provide you with some extra details on how to use the fonts.

Paul Irish has a great blog post about font-face and how to use it properly here. (go to his blog and search for font-face) I would have posted the link myself but I can’t post more than one link cause I’m a new user.

Hope this helps!