<header>
  <h1>Pseudo-klasse-øvelse</h1>
  <p>Fremhæv det andet element med klassen "featured".</p>
</header>

<section>
  <article class="featured"></article>
  <article></article>
  <article class="featured"></article>
  <article></article>
  <article></article>
  <article class="featured"></article>
  <article></article>
  <article></article>
  <article></article>
</section>