Moving this from www-style (didn’t look issue-worthy at first):

“CSS Cascading and Inheritance” levels 4–6 speak of an encapsulation context, alas the definition is vague.

The example given, “such as nested tree contexts of shadow trees,” suggests there are other contexts that make for an encapsulation context, but it does not clarify what the determining factor is. In consequence, it seems open, too, whether a declaration would always be part of an encapsulation context, or if it would not.

(I understand an encapsulation context to be “implied,” but how it’s defined and scoped exactly isn’t clear when reviewing.)

Is there another section, not showing up in search, that would clarify, or is (or could) this be clarified in another draft?