[Webkit-unassigned] [Bug 265926] New: No support for Kai and Fangsong generic font families

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265926

            Bug ID: 265926
           Summary: No support for Kai and Fangsong generic font families
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xfq.free at gmail.com
                CC: mmaxfield at apple.com

There are many font styles used in Chinese composition, but Song, Kai, Hei, and Fangsong are the most important ones.

The `font-family` CSS property should support generic family names for these font styles.

More: https://www.w3.org/TR/clreq/#four_commonly_used_typefaces_for_chinese_composition

`generic(kai)` and `generic(fangsong)` are not supported by WebKit.

css-fonts-4 describes `generic(kai)` and `generic(fangsong)` in CSS: https://drafts.csswg.org/css-fonts-4/#generic-font-families

The Kai and Fangsong generic font families significantly improves the fallback mechanism of Chinese websites and web applications. If the browsers does not support them, the differences expressed by the font styles won't appear (unless the developer use web fonts, which is often too large).

### Tests & results

Interactive test, [font-family:generic(kai) will apply a Kai font in Chinese](https://github.com/w3c/character_phrase_tests/issues/62)

Interactive test, [font-family:generic(fangsong) will apply a Fangsong font in Chinese](https://github.com/w3c/character_phrase_tests/issues/25)

### CSS issue

https://github.com/w3c/csswg-drafts/issues/4606 (closed)

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