HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :has() Basic Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    .box {
      border: 2px solid #cbd5e1;
      background: #f1f5f9;
      padding: 1rem;
      border-radius: 0.5rem;
      margin-bottom: 0.75rem;
      max-width: 20rem;
    }

    .box:has(a) {
      border-color: #2563eb;
      background: #eff6ff;
    }

    .box a {
      color: #2563eb;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <div class="box">
    <p>This is a box with text only.</p>
  </div>
  <div class="box">
    <p>This box has an <a href="#">anchor</a> inside.</p>
  </div>
</body>
</html>

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CSS :has() Selector - Box with Link