Generate partial IDL fragments for CSS properties for WPT?

CSSOM defines up to three partial interfaces that are created for each supported property:

partial interface CSSStyleDeclaration {
  [CEReactions] attribute [LegacyNullToEmptyString] CSSOMString _camel_cased_attribute;
};
partial interface CSSStyleDeclaration {
  [CEReactions] attribute [LegacyNullToEmptyString] CSSOMString _webkit_cased_attribute;
};
partial interface CSSStyleDeclaration {
  [CEReactions] attribute [LegacyNullToEmptyString] CSSOMString _dashed_attribute;
};

It would be nice to have these tested in WPT, whether Reffy itself generates these or whether they’re generated merely for the WPT export.

See also https://github.com/tabatkins/bikeshed/issues/549 for a Bikeshed feature request to add generation of these to Bikeshed, and w3c/csswg-drafts#5412 for potential pitfalls here (though as far as I’m aware no such property is currently defined)

[tidoust]

Summary of the discussion in #111 on this topic: generating the IDL is not that useful but having the IDL attribute names that each property generates is. Goal is thus to add a styleDeclaration key to property descriptions in CSS extracts that is an array with IDL attribute names. For instance:

 {
   "properties": {
     "align-content": {
       "styleDeclaration": ["align-content", "alignContent"]
     }
   }
 }

[tidoust]

All CSS properties descriptions now contain a styleDeclaration property. Released in @webref/css@1.1.0.