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chromium/third_party/blink/web_tests/external/wpt/css/css-cascade/scope-featureless.html 

<!DOCTYPE html>
<title>:scope Selector Cannot be Featureless Outside of @scope</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scoped-styles">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1904228">
<link rel="match" href="scope-featureless-ref.html">
<style>
:root {
  background: white;
  color: white;
}

:scope {
  --font-color: black;
}

#dut {
  color: var(--font-color);
}
</style>
<div id="dut">Test</div>