code: def com_google_fonts_check_varfont_weight_instances(ttFont):
    
  
    failed = False
    for instance in ttFont["fvar"].instances:
      if 'wght' in instance.coordinates and instance.coordinates['wght'] % 100 != 0:
        failed = True
        yield FAIL, ("Found an variable font instance with"
                    f" 'wght'={instance.coordinates['wght']}."
                     " This should instead be a multiple of 100.")
  
    if not failed:
      yield PASS, "OK"
docs: Variable font weight coordinates must be multiples of 100.