[css-display] Link "replaced element" to CSS Display instead of CSS2

[Loirooriol]

CSS Display defines "replaced element" in the same spec, so there is no need to link CSS2.

[SelenIT]

By the way, shouldn't the definition of the "replaced element" in CSS be synchronized with the corresponding definition in HTML? For example, the MDN page, based on CSS definition, lists input and textarea as replaced elements, while the 'Rendering' section of the HTML spec explicitly lists them as non-replaced (and introduces the term 'widget' instead).

[tabatkins]

@Loirooriol Ah, thanks, those links pre-date us adding the definition to this spec.

@SelenIT Yes, there's a category of "semi-replaced" that we've been edging around in CSSWG discussions for a little bit that we need to formalize at some point - their layout is described by CSS, but they have some intrinsic sizing qualities like a replaced element does. input and textarea both fall into this.