[Popup spec] Update autofocus specifications in HTML for popup

[melanierichards]

#355 lands a first editor's draft of <popup> in Open UI, and is intended to be brought to various parts of the HTML spec in WHATWG. Regarding autofocus language, @domenic's advice was to update the autofocus attribute portion of the spec for popup.

Opening this issue to track the edit as suggested. We can add a snippet to the Open UI spec as I've done here: https://open-ui.org/components/popup#html-incubation-text-user-interaction-focus-processing-model

[github-actions[bot]]

There hasn't been any discussion on this issue for a while, so we're marking it as stale. If you choose to kick off the discussion again, we'll remove the 'stale' label.

[josepharhar]

My HTML spec PR includes changes to get focus delegate which support the autofocus-only behavior for popovers.

This issue can be closed