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+<!DOCTYPE html>
+<title>Specificity of :host() inside :is()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
+<link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector">
+<style>
+ main :not(:is(:host(#a))) { color: green; }
+ main :not(:is(:host(.a))) { color: red; }
+</style>
+<main>
+ <div id=element>Green</div>
+</main>
+<script>
+ test(function() {
+ assert_equals(getComputedStyle(element).color, 'rgb(0, 128, 0)');
+ }, 'Specificity of :host() inside :is()');
+</script>