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New feature: symbols() #4203

Description

@4n4ny4

Specification

https://drafts.csswg.org/css-counter-styles-3/#symbols-function

Description

The symbols() CSS function defines an inline (anonymous) counter style directly
where a counter style is expected (as a list-style-type value and inside
counter() / counters() ) without having to declare a named @counter-style rule.
Requesting it be split into its own web-features ID so its Baseline/availability can be
tracked separately from list-style / @counter-style while it works toward interop.

Documentation

https://developer.mozilla.org/en-US/docs/Web/CSS/symbols

Browser support

Proposed feature ID: counter-style-symbols (alt: symbols)
Proposed compat_features (move out of the list-style feature):

  • css.properties.list-style-type.symbols
  • css.properties.list-style.symbols
    Note: there may be no BCD key yet for symbols() inside counter()/counters(); that key
    likely needs to be added in mdn/browser-compat-data and then included here.

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