[css-fonts] Propose adding lang as a font-face descriptor #1744
Description
See https://drafts.csswg.org/css-fonts-3/#at-font-face-rule
Per the discussion in #1736, we note that generic fonts typically map to more than one system font with lang affecting the resultant font. Adding lang as a @font-face descriptor might be useful for similar reasons, for example with CJK:
- CJK have partially intersecting character sets, so
unicode-rangealone cannot specify fonts for each language. This can be an issue on pages containing text in more than onelang. - Even if a single font (or
@font-face) contains faces for all the characters in some text, that font may not be for the correctlangeverywhere. (A single codepoint can map to different variant glyphs depending onlang, and this is reflected in fonts.)
This addition would allow fonts to resolve lang-appropriately when a font family specified with @font-face is applied to a page with multiple langs.