closing popover with timer is not in conformance with WCAG recommendation

[Jxck]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Popover_API/Using#dismissing_popovers_automatically_via_a_timer

What specific section or headline is this issue about?

Dismissing popovers automatically via a timer

What information was incorrect, unhelpful, or incomplete?

as mentioned by @keithamus at whatwg/html#10428 (comment)
closing popover with timeout (time based UI) is not in conformance with WCAG 2.2.3.

What did you expect to see?

it should be removed to prevent incorrect usage from spreading.

Do you have any supporting links, references, or citations?

Original issue: whatwg/html#10428 (comment)

Now I'm working on updating Spec example too.
whatwg/html#10469

Do you have anything more you want to share?

Toast UI is basically coupled with Timeout.
So toast demo should be reconsidered too.
https://mdn.github.io/dom-examples/popover-api/toast-popovers/