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Why is “DejaVu Serif” selected when I specify “Release Mono” in CSS?

I am using the Iceweasel browser (derived from Firefox) on a Debian system with the XFCE4 desktop.

I did not define any custom font substitution in ~ / .config / fontconfig / fonts.conf.

This is what fc-match tells me.

lone@debian:~$ fc-match "Liberation Mono"
n022003l.pfb: "Nimbus Mono L" "Regular"
lone@debian:~$ fc-match Courier
n022003l.pfb: "Nimbus Mono L" "Regular"
lone@debian:~$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

Therefore, I expect that when I have HTML, the font "Liberation Mono" should give the same results as when using "Courier". But, as you can see in the screenshot below, this is not the case (JSFiddle: http://jsfiddle.net/8L3rmyxn/ ).

enter image description here

I clicked the "Check item" button and found the fonts used.

, "Liberation Mono" CSS, "DejaVu Serif" , fc-math.

"" CSS "Nimbus Mono L" , fc-match.

, "monospace" CSS, "DejaVu Sans Mono", fc-match.

"Liberation Mono" "Nimbus Mono L" "DejaVu Serif" ?

, . " " ~/.config/fontconfig/fonts.conf, , " " "" .

lone@debian:~$ cat ~/.config/fontconfig/fonts.conf 
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
    <alias>
        <family>Liberation Mono</family>
        <prefer><family>Nimbus Mono L</family></prefer>
    </alias>
</fontconfig>
lone@debian:~$ fc-match "Liberation Mono"
n022003l.pfb: "Nimbus Mono L" "Regular

enter image description here

,

. fonts.conf, "Liberation Mono" CSS, "Nimbus Mono L" "DejaVu Serif" , fc-match "Liberation Mono" , , fonts.conf ?

+4
1

Firefox 3 fontconfig.

gfx.font_rendering.fontconfig.max_generic_substitutions about: config, . - 127.

+2

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