[csswg-drafts] [css-cascade-5] Define preshint as its own cascade layer, below all other author layers (#5856)

fantasai has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-cascade-5] Define preshint as its own cascade layer, below all other author layers ==
We're effectively doing this already via a specificity hack, but now that we have layers we can define it as its own layer and not worry about specificity.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5856 using your GitHub account


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