<dialog> should be able to focus the previously focused element in other frames

[sefeng211]

looking at the spec for <dialog>, Set this's previously focused element to the focused element doesn't account the case where the current focused element is in a different same-origin frame. We should be able to allow moving focus to that.

Apologies since I added this line. I am not sure the correct wording to fix it.

[annevk]

I think you want to use https://html.spec.whatwg.org/#currently-focused-area-of-a-top-level-traversable and then do a same-origin check on the resulting focusable area's DOM anchor's document's origin maybe?

[sefeng211]

That algorithm is confusing to me. It says traversable is the focusable area-or-null returned by this algorithm and the step one talks to traversable straightly, but what traversable is at the moment?

[annevk]

https://html.spec.whatwg.org/#top-level-traversables (it's roughly a top-level browsing context, but different due to COOP+COEP iirc)