Jan: for reference, the way that kind of font stack works is that it would only specify certain fonts for the users that already have them installed on their system, using font families and a fallback list. It would never deliver a new proprietary font to a user, such as through Web fonts importing of typefaces. Each user would see slightly different but similar typefaces depending on what their system has, which is why the "Wikimedia Foundation Design/Typography" page describes a list of fonts that include core fonts for Windows, Linux, and OSX.