Should dialog removal steps unset is modal flag?

[lukewarlow]

What is the issue with the HTML Standard?

The dialog element's removal steps don't set is modal flag to false. See https://html.spec.whatwg.org/#pseudo-classes:is-modal:~:text=dialog%20HTML%20element%20removing%20steps

I would expect this to happen based on the first sub-test's final assertion inside of https://wpt.live/css/selectors/modal-pseudo-class.html

[lukewarlow]

It's sort of odd that removing a dialog doesn't close it, this is what popover does?

It's particularly strange that if you remove a modal dialog and re-add it it's still open but now it's not modal (or in the top layer)?

[domenic]

I think #5802 is pretty related.

[lukewarlow]

Turns out this was already raised here #6216 and fixed here 9fcb6c3 so it seems to have regressed somehow?