gistfile1.txt

<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'urn:fontconfig:fonts.dtd'>
<fontconfig>

  <!-- Modern generic that `-apple-system` maps to in Chrome -->
  <alias>
    <family>system-ui</family>
    <prefer>
      <family>SF Pro Display</family><!-- big sizes -->
      <family>SF Pro Text</family>   <!-- ≤20 px, optional -->
    </prefer>
  </alias>

  <!-- Older WebKit/Blink literals that still appear in CSS stacks -->
  <match target="pattern">
    <test qual="any" name="family"><string>BlinkMacSystemFont</string></test>
    <edit name="family" mode="assign" binding="same">
      <string>SF Pro Display</string>
    </edit>
  </match>

  <match target="pattern">
    <test qual="any" name="family"><string>-apple-system</string></test>
    <edit name="family" mode="assign" binding="same">
      <string>SF Pro Display</string>
    </edit>
  </match>

</fontconfig>