[webkit-dev] Request for position: CSS tree-scoped at-rule names and refs (for @font-face etc.)

[Xiaocheng Hu]

Hi webkit-dev,

This is a request for WebKit's position on CSS tree-scoped names and
references for @font-face, @keyframes, @counter-style and other
name-defining at-rules.

Spec:
  https://drafts.csswg.org/css-scoping/#shadow-names

Explainer:
  https://drafts.csswg.org/css-scoping/#example-f1503361
  https://drafts.csswg.org/css-scoping/#example-ee72cb37

Existing WebKit bug:
  I'm not aware of any WebKit bug for exactly the same issue. Please let me
know if I missed any. There are some related bugs as listed below:
  https://bugs.webkit.org/show_bug.cgi?id=72461
  https://bugs.webkit.org/show_bug.cgi?id=186837

Summary:

It has been a long standing issue on how name-defining at-rules should be
handled across shadow tree boundaries. The existing behaviors are
non-interoperable between browsers, and even inconsistent in the same
browser between different rules [1]. Following a recent CSSWG resolution
[2], a new and reasonable behavior has been proposed. Chrome is planning to
implement this new behavior, starting with the @counter-style rule [3].

[1] https://wiki.csswg.org/spec/css-scoping
[2] https://github.com/w3c/csswg-drafts/issues/1995#issuecomment-848941922
[3] https://chromestatus.com/feature/5716198446596096
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