<!doctype html>
<meta charset="utf-8">
<title>@import rule with supports parsing / serialization</title>
<link rel="author" href="mailto:oj@oojmed.com">
<link rel="help" href="https://drafts.csswg.org/css-cascade-4/#at-import">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  function setupSheet(rule) {
    const style = document.createElement("style");
    document.head.append(style);
    const {sheet} = style;
    const {cssRules} = sheet