[css-values] Distinction between attr(foo type(<string>)) and attr(foo string) is too subtle

[mozilla-apprentice]

A resolution was made for csswg-drafts/#11645.

[css-values] Distinction between `attr(foo type(<string>))` and `attr(foo string)` is too subtle

• RESOLVED: Rename string keyword to raw-string

Discussion.

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[dholbert]

If I understand correctly, this was just a spec clarity thing; no implementation changes needed.