variables-ruletree-cache-01.html

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<!DOCTYPE html>

<style>

  p { --foo: purple; background-color: var(--foo) }

  p#myid { --foo: blue }

</style>

<p>This should be purple, and might cache background in the rule tree.</p>

<p id="myid">This should be blue, and can't used that cached struct,

which really shouldn't be cached anyway.</p>