[whatwg/dom] Allow more characters in element/attribute names and prefixes (PR #1079)

Closes #849.

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Points for discussion:

- I did not disallow `=` inside attribute local names. Both the parser and DOM APIs currently disallow them, except the parser allows it for the first character. I'm happy to change this if people prefer; I started with the simpler version.
- This does not disallow lone surrogates, the Unicode replacement character U+FFFD, single quotes, or < in any position, because the HTML parser allows introducing those already and it seems nicer to align.
- I did not change validation for `createProcessingInstruction()` or `createDocumentType()`. We could try to simplify those too, perhaps after investigating parser behavior. But they didn't seem to be causing any real web developer pain, unlike elements and local names, so I thought it'd be better to just leave them as-is.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1079


-- Commit Summary --

  * Allow more characters in element/attribute names and prefixes

-- File Changes --

    M dom.bs (96)

-- Patch Links --

https://github.com/whatwg/dom/pull/1079.patch

https://github.com/whatwg/dom/pull/1079.diff


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