Re: [csswg-drafts] [css-values-4] Switch advanced attr() to being var()-like (#4482)

1. It's an intentional change. It lets you provide fallback of a different type entirely when the argument is missing. (Like `width: attr(w px, auto);`)

2. Fallback isn't parsed at all. The WPT looks like it's wrong? It will fail to parse the attribute (since "300px" isn't a number), then substitute in 200, which isn't a valid 'width' value in non-quirks pages, making the div iacvt so it reverts to "auto" and won't match the ref.

3. Yes, that's fine. Fallback isn't parsed by attr() at all.

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