L. David Baron

I believe this doesn't have good fallback for either: * nested `sub` or `sup`, or * superscripts or subscripts that contain some characters for which the font has special glyphs...

For what it's worth, one of the major discussions the CSS WG had about this feature was [this one in Kyoto](https://lists.w3.org/Archives/Public/www-style/2011Jun/0329.html) discussing [this proposal](https://lists.w3.org/Archives/Public/www-style/2011Apr/0391.html) to address some of the issues...

There was also [this later discussion](https://lists.w3.org/Archives/Public/www-style/2013Jul/0065.html) on what happens when these subscripts/superscripts are underlined; I forgot about that issue!

This isn't duplication; `:host` and `:host()` are different. I think it was intentionally written this way.

This feature is closely tied to much of the other material in contain level 3 -- it's an important prerequisite for container queries. Given that container query implementation is happening...

It's worth noting that `bolder` and `lighter` used to be defined this way, but we decided to change to the current definition. I don't recall all of the reasoning (although...

It's not clear to me (particularly given https://github.com/w3c/csswg-drafts/issues/1594#issuecomment-952428022) whether this issue should cover all additive cascading concepts in CSS, or only those intended for animation. Also, for what it's worth,...

Is the difference between what you propose here for combobox ``s (i.e., those with [display size](https://html.spec.whatwg.org/multipage/form-elements.html#concept-select-size) == 1) and their current default behavior that: * the current default behavior sizes...

I wonder whether that's enough of a non-edge-case to say that we should just abandon this idea and recommend `window.matchMedia(mediaRule.mediaText)` instead.

cc @xiaochengh @tabatkins, although it's possible this would better be filed in https://github.com/tabatkins/specs/issues