list all your selectors with :has() somewhere in them
keep track of all elements that match the rest of the selector
follow the selector up to whatever ancestor (or descendant) the :has() applies to
keep track of these elements and only re-compute styles for changes inside them
spend another three to four decades fixing the countless bugs in your implementation, and the bugs you create by fixing those bugs, and the bugs resulting from optimisations of your previous bugfixes...
/s
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It's super easy:
:has()somewhere in them:has()applies to/s