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 font-weight Relative Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .parent {
      font-weight: 400;
      max-width: 36rem;
      color: #334155;
    }

    .parent .emphasis {
      font-weight: bolder;
    }

    .parent .muted {
      font-weight: lighter;
    }
  </style>
</head>
<body>
  <h1>Relative Font Weight</h1>
  <p class="parent">
    Normal body text with
    <span class="emphasis">bolder emphasis</span> and
    <span class="muted">lighter muted text</span>.
  </p>
</body>
</html>

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CSS font-weight Property - bolder and lighter