HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS letter-spacing Variable Example</title>
  <style>
    :root {
      --heading-track: 0.08em;
    }

    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    h1, h2, h3 {
      letter-spacing: var(--heading-track);
    }
  </style>
</head>
<body>
  <h1>Page Title</h1>
  <h2>Section Title</h2>
  <h3>Subsection heading</h3>
</body>
</html>

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CSS letter-spacing Property - CSS variable