[selectors-4] Should we have :open and :closed?

[josepharhar]

It was resolved here to have both :open and :closed pseudo-classes: #7319 (comment)

@annevk mentioned here that :closed is redundant with :not(:open): WebKit/standards-positions#413 (comment)

Here is the justification for having both of them: #7319 (comment)

Should we also talk about adding the corresponding :closed pseudo class? That would avoid the problem that :not(:open) can match anything, including things that don't open or close.

The HTML spec has not been merged yet: whatwg/html#10126

[annevk]

Note in particular that the justification for :closed is no longer valid with the current HTML PR. We did not want to make :closed only match things that can be closed as this set of items might change over time.

[tabatkins]

Okay, if you purposely don't want to hook :closed to the "openability" of an element, then yeah, it's completely redundant with :not(:open) and we probably shouldn't add it.

[josepharhar]

I am in favor of removing :closed