compress inefficient use of unicode-range

[loominade]

If an embedded font only contains characters used on certain pages, one wouldn't want to download it if its used on the current page. By defining the unicode-range of a font in a @font-face description, this can be achieved. But writing down all the codepoints in a font creates a very long unicode-range definition that can be shorted by collapsing groups.

Input CSS

@font-face {
  font-family: 'Openmoji';
  unicode-range: U+F0A0, U+F0A1, U+F0A2, U+F0A3, U+F0A4, U+F0A5, U+F0A6, U+F0A7, U+F0A8, U+F0A9, U+F0AA, U+F0AB, U+F0AC, U+F0AD, U+F0AE, U+F0AF;
}

Actual output CSS

– no change –

Expected output CSS

@font-face {
  font-family: 'Openmoji';
  unicode-range: U+F0A?;
}

[jakubpawlowicz]

Won't fix as clean-css is going into maintenance mode.