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

foolip left a comment (whatwg/dom#1454)

We need to decide which parser is used to parse attributes from `data`, and I think these are all of the options:

1. HTML or XML parser depending on the node document, similar to `innerHTML`. This was the initial state of this PR, via [fragment parsing algorithm steps](https://html.spec.whatwg.org/#fragment-parsing-algorithm-steps)
2. HTML parser everywhere except for `<?xml-stylesheet?>`, which would use the XML parser.
3. Always use the HTML parser
4. Always use the XML parser
5. A bespoke parser with whatever properties we'd like, possibly being more strict for `<?xml-stylesheet?>`.

Option 2 seems like the most plausible to me right now, if we decide to make `<?xml-stylesheet x:href="" href="..."?>` no longer work.

@annevk WDYT?

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