HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:has(+ h2)</title>
  <style>
    body {
      margin: 16px;
      font-family: system-ui, sans-serif;
      color: #0f172a;
    }

    h1 {
      margin: 0 0 1rem;
    }

    h1:has(+ h2) {
      margin-bottom: 0.25rem;
      color: #1d4ed8;
    }

    h2 {
      margin: 0 0 0.75rem;
      color: #64748b;
      font-size: 1rem;
    }
  </style>
</head>
<body>
  <h1>With subtitle</h1>
  <h2>Subtitle follows</h2>
  <p>Closer gap after the h1.</p>

  <h1>Without subtitle</h1>
  <p>Normal gap when no h2 follows.</p>
</body>
</html>

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