69-local.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
        <!-- serif -->
        <match target="pattern">
                <test qual="any" name="family">
                        <string>serif</string>
                </test>
                <edit name="family" mode="prepend" binding="strong">
                        <string>Roboto Slab</string>
                </edit>
        </match>

        <!-- sans-serif -->
        <match target="pattern">
                <test qual="any" name="family">
                        <string>sans-serif</string>
                </test>
                <edit name="family" mode="prepend" binding="strong">
                        <string>Masifa</string>
                        <string>Noto Sans CJK TW</string>
                </edit>
        </match>

        <!-- Copy from 69-language-selector-ja.conf settings. -->
        <match target="font">
                <test qual="all" name="family">
                        <string>sans-serif</string>
                </test>
                <test qual="all" name="pixelsize" compare="less_eq">
                        <double>18</double>
                </test>
                <edit mode="assign" name="embeddedbitmap">
                        <bool>false</bool>
                </edit>
                <edit mode="assign" name="hintstyle">
                        <const>hintnone</const>
                </edit>
        </match>

        <!-- monospace -->
        <match target="pattern">
                <test qual="any" name="family">
                        <string>monospace</string>
                </test>
                <edit name="family" mode="prepend" binding="strong">
                        <string>Fira Code</string>
                        <string>Noto Sans Mono CJK TW</string>
                </edit>
        </match>
</fontconfig>