UbuntuHelp:Fontweightsinx11

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https://help.ubuntu.com/community/fontweightsinx11

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English

Font Weights in X11

I was messing with fonts for a website, and wound up curious what exactly was going on when you leave off the font type in css, or if you specify the default families, such as sans-serif. Sure in Firefox preferences, you could set sans-serif to be any font, but it defaults to 'sans-serif' which is not a real font at all but some kind of default. I looked all over the gnome preferences for some setting defining what sans-serif was with no luck. A bunch of hunting around and research later, and I found the answer, in /etc/fonts/conf.d/ there are a bunch of xml rules files which tell X11 what to do. Example: 60-latin.conf

                <family>sans-serif</family>
                <prefer>
                        <family>DejaVu Sans</family>
                        <family>Bitstream Vera Sans</family>
                        <family>Verdana</family>
                        <family>Arial</family>
                        <family>Albany AMT</family>
                        <family>Luxi Sans</family>
                        <family>Nimbus Sans L</family>
                        <family>Helvetica</family>
                </prefer>

So here we see that for latin fonts, sans-serif translates into the first-available from the list. DejaVu if you have it, Bitstream if you have that, etc down to Helvetica. Magic!

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