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Test Info:

<!doctype html>
<meta charset="utf-8">
<title>:host and :is, descendant</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<p>Test passes if there is a filled green square.</p>
<div>
<template shadowrootmode=open>
<style>
#foo {
width: 100px;
height: 100px;
background: red;
}
:host, :root {
#foo {
background: green;
}
}
</style>
<div id=foo></div>
</template>
</div>