Re: [whatwg/dom] Set registry on null registry element on adopt instead of on insert (PR #1423)

ja-y-son left a comment (whatwg/dom#1423)

@rniwa One thing I'd like to clarify from your [PR](https://github.com/WebKit/WebKit/pull/54004): One of the test files added is phrased as "append does not upgrade". However, is it correct that we still want to run upgrade during append/insertion steps? It is possible that a null registry element gets a registry when it's appended cross document (which involves adopt steps). In that case we'll want to run an upgrade on the element right? Want to make sure I got the correct understanding here.

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