Philip Jägenstedt

Missing _not_ in the last sentence? In Blink most of what was in HTMLDocument has already been moved to Document, see https://github.com/whatwg/dom/issues/221#issuecomment-209989740. The set of things that are in HTMLDocument...

@annevk will know, but probably the original motivation was that it's possible to insert any element into any document, so having a type of the document itself doesn't achieve much....

@smaug----, can you comment on Gecko plans?

> I agree with bz. We need to do this per property, not all at once. And while doing it, it is possible that we figure out the merge isn't...

Some thoughts on the WebKit ToT list from https://github.com/whatwg/dom/issues/221#issuecomment-240182587 - `document.all` looks to me like it it'd work just fine with any kind of document. The implementation itself is already...

I did a little bit of research with `SELECT page,url FROM [httparchive:har.2016_08_01_chrome_requests_bodies] WHERE body CONTAINS 'instanceof XMLDocument'` in BigQuery: - [htmldocument.csv](https://gist.github.com/foolip/5109c805a6cd5eb1117607da17b55582) (used `WHERE RAND() < 1/10` to get about 10%,...

https://github.com/whatwg/dom/issues/308 is also relevant. I realized that "object HTMLDocument" and "object XMLDocument" are also relevant for compat. I find 606 instances of "object HTMLDocument" and 9243 instances of "object XMLDocument"....

In https://github.com/whatwg/dom/issues/221#issuecomment-210115403 I said "Not sure how risky the final step of making `HTMLDocument` an alias is, we'll just have to try it" upon which the issue was closed. After...

Yes, but it'd also start "working" for things that aren't currently `instanceof HTMLDocument`, the whole point of the check seems to be to get at the https://dom.spec.whatwg.org/#html-document state. It's _possible_...

That probably happens, but the case that dominated in https://github.com/whatwg/dom/issues/221#issuecomment-244738573 was about case sensitivity.