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<!doctype html>
<meta charset="utf-8">
<title>CSS Selectors Invalidation: :nth-last-child(... of class) within shadow root</title>
<link rel="author" title="Zach Hoffman" href="mailto:zach@zrhoffman.net">
<link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">
<link rel="match" href="nth-last-child-of-in-shadow-root-ref.html">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<div id="host">
<template shadowrootmode="open">
<style>
div:nth-last-child(even of .foo) {
color: green;
}
</style>
<div class="foo">Should be green</div>
<div class="foo">No green</div>
<div class="foo" id="toggler">No green</div>
</template>
</div>
<script>
host.offsetTop;
host.shadowRoot.getElementById("toggler").classList.toggle("foo");
</script>
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