I haven't looked at their code (though I will definitely try this project out soon!), but I'd guess that their javascript library is parsing the SVG then dynami

I haven't looked at their code (though I will definitely try this project out soon!), but I'd guess that their javascript library is parsing the SVG then dynamically replacing it with a flash object. I've seen some type-layout libraries that do the same thing using Flash, so that you can use non-standard fonts on your website.