sapphire-frontend/style/emoji-noto.css

/* Emoji stylesheet preferring Noto Color Emoji for non-old-Firefox */

@font-face {
    font-family: sapphire-emoji;

    /* Create emoji variant */
    src: local('Noto Color Emoji'),
         local('Apple Color Emoji'),
         local('Android Emoji'),
         local(Symbola);

    /* Bind to the emoji range */
     unicode-range: U+1F300-1F5FF, U+1F600-1F64F, U+1F680-1F6FF, U+2600-27FF;
}