HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>font-size: percentage</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
      font-size: 16px;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .demo {
      font-size: 150%;
    }
  </style>
</head>
<body>
  <p>Body is 16px. <strong>font-size: 150%</strong> on the next line is 1.5 × that parent size.</p>
  <p class="demo">Text sized at 150%.</p>
</body>
</html>

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CSS font-size Property — percentage