I want access to attr() within calc()

[aarongustafson]

We have access to attribute values (via attr()) in generated content. It would be nice to have that access elsewhere too. For example, it could be useful to access a data-* attribute and pull that value into a calculated width (using calc()).

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https://webwewant.fyi/wants/5e601f17c9c2383abc475f5c/