HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:has() contains</title>
  <style>
    body {
      margin: 16px;
      font-family: system-ui, sans-serif;
      color: #0f172a;
    }

    section {
      margin-bottom: 0.75rem;
      padding: 0.75rem;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
    }

    section:has(.featured) {
      border: 2px solid #2563eb;
      background: #eff6ff;
    }
  </style>
</head>
<body>
  <section>
    <article class="featured">Featured content</article>
  </section>
  <section>
    <article>Regular content</article>
  </section>
</body>
</html>

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CSS :has() Pseudo-Class — contains child