CodePen Embed - 15. Nested menu pop-ups

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class=\\\"top-app-bar elevation-1\\\">\\n  <nav>\\n    <span class=\\\"title\\\">Web Shop</span>\\n    <span class=\\\"nav-links\\\">\\n      <a href=\\\"#\\\">Home</a>\\n      <button popovertoggletarget=\\\"products\\\">\\n        Products\\n        <i class=\\\"material-icons\\\">expand_more</i>\\n      </button>\\n      <a href=\\\"#\\\">Pricing</a>\\n    </span>\\n    <div popover class=\\\"menu elevation-3\\\" id=\\\"products\\\">\\n      <ul>\\n        <li>\\n          <a autofocus href=\\\"#\\\">HTML</a>\\n        </li>\\n        <li>\\n          <button popovertoggletarget=\\\"css\\\">\\n            CSS\\n            <i class=\\\"material-icons\\\">chevron_right</i>\\n          </button>\\n        </li>\\n        <li>\\n          <a href=\\\"#\\\">JavaScript</a>\\n        </li>\\n      </ul>\\n    </div>\\n  </nav>\\n  <div popover class=\\\"menu elevation-3\\\" id=\\\"css\\\">\\n    <ul>\\n      <li>\\n        <a autofocus href=\\\"#\\\">:has()</a>\\n      </li>\\n      <li>\\n        <a href=\\\"#\\\">Anchoring</a>\\n      </li>\\n      <li>\\n        <a href=\\\"#\\\">Properties and Values API</a>\\n      </li>\\n    </ul>\\n  </div>\\n</header>\\n<main>\\n  <h1>Welcome to the Web Shop</h1>\\n</main>\",\"css\":\"@layer demo {\\n  [popover] {\\n    margin: 0;\\n    background: var(--md-sys-comp-top-app-bar-background-color);\\n  }\\n\\n  button[popovertoggletarget] {\\n    box-shadow: none;\\n    font-size: inherit;\\n  }\\n\\n  .menu {\\n    border: 0;\\n    padding: var(--size-4);\\n    border-radius: var(--radius-2);\\n  }\\n\\n  :is(a[href], button):is(:hover, :focus-visible) {\\n    color: var(--blue-8);\\n    text-decoration: none;\\n  }\\n\\n  .menu ul {\\n    list-style-type: none;\\n    padding: 0;\\n    margin: 0;\\n  }\\n\\n  .menu li {\\n    width: 100%;\\n    padding: 0;\\n    text-align: left;\\n  }\\n\\n  .nav-links {\\n    display: inline-flex;\\n    gap: var(--size-4);\\n    align-items: center;\\n    justify-content: center;\\n  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