Re: [whatwg/dom] Make element and attribute names behave like the HTML parser (#449)

OK, so we finally have data!

- DOM valid, HTML parser invalid: 0.047 % page loads
- DOM invalid, HTML parser valid: 0.000003 % page loads

Unfortunately, it looks like simply aligning with the HTML parser is not going to be possible. @dominiccooney mentioned it might be possible to change the parser to allow more, but in general that's pretty high-cost and risky. Unless there's some unexpected enthusiasm for that, I'd rather set it aside.

What do people think of just expanding the valid-in-DOM category? Then we will still have two categories, but at least valid-in-DOM will be a superset of valid-in-HTML. I could work on updating this PR to illustrate that concretely, if people would like.

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