Re: [whatwg/fullscreen] Drop the iframe ancestor check? (#45)

IIUC, that is about something in the same document between `<iframe>` and `</iframe>`?

Does `<iframe>` really have any descendant element? It seems to me browsers agree on the behavior that any content between `<iframe>` and `</iframe>` are just parsed as raw text, and would not construct any element. And this is also what the HTML Standard says [1].

So if that is what we are discussing here, I think it makes sense to just remove this check, because now it no longer makes any sense given the HTML parsing algorithm. And based on this, I don't quite believe having this check or not could make anything easier or harder.


[1] Search `A start tag whose tag name is "iframe"` in [this page](https://html.spec.whatwg.org/multipage/syntax.html).

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