Re: [whatwg/dom] Define processing instruction attributes (PR #1454)

foolip left a comment (whatwg/dom#1454)

Thanks @annevk!

Always using the HTML parser is straightforward in spec and implementation, the only thing that's not ideal about is that the more lenient parsing of `<?xml-namespace?>` may affect non-browser tooling. Basically what @zcorpan said, "I assume some folks would be upset if browsers start to use an HTML parser to parse the `xml-stylesheet` pseudo-attributes in XML documents."

With a bespoke parser, that's mostly straightforward with "[collect a sequence of code points](https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points)", but is there a way to decode character entities in attribute values that doesn't duplicate all of the tokenizer states character entities? Or could we do something simpler that ends up diverging slightly from how regular attribute values are parsed?

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