Don't be so sure: http://www.adobe.com/devnet/opentype/afdko/topic_font_wt_win.html
On Fri, Aug 03, 2012 at 10:14:54AM +0100, vern adams wrote: > It's a bad OS/2 usWeightClass value (nothing to do with CSS). So, the '250' is > getting rounded up to '300' and therefore clashing with the Light version > which > already has WeightClass of 300. > I think it's simple human error; the usWeightClass in the 'font.ttf' that > Adobe > have included with the source of Source Sans Extra Light is '200'. > Also, some of the fonts have fsType of 0x0004 (Documents containing Preview & > Print fonts must be opened "read-only;" no edits can be applied to the > document), but i assume Adobe means all the Source Sans fonts should be set to > 0x0000. > -v > > > On 3 Aug 2012, at 09:51, Denis Jacquerye <moy...@gmail.com> wrote: > > > OpenType allows weight values from 1 to 999. > CSS is the one rounding those to multiples of 100 from 100 to 900. > Fontconfig maps them to some range from 0 to 210 (I'm not sure there). > Fontconfig also has multiple aliases for its weight value 40: > extralight or ultralight, and its weight value 210: black or heavy. So > applications just using those values to name variants might not match > the OT names. > >
