<fontconfig>

    <match>

        <test name="lang">

            <string>zh-cn</string>

        </test>

        <test name="family">

            <string>serif</string>

        </test>

        <edit name="family" mode="prepend">

            <string>Source Han Serif CN</string>

            <string>Source Han Serif TW</string>

        </edit>

    </match>

    <match>

        <test name="lang">

            <string>zh-sg</string>

        </test>

        <test name="family">

            <string>serif</string>

        </test>

        <edit name="family" mode="prepend">

            <string>Source Han Serif CN</string>

            <string>Source Han Serif TW</string>

        </edit>

    </match>

    <alias>

        <family>Source Han Serif CN</family>

        <default>

            <family>serif</family>

        </default>

    </alias>

</fontconfig>