三段文字设置不同的字体粗细 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    p.normal {
      font-weight: normal;
    }

    p.light {
      font-weight: lighter;
    }

    p.thick {
      font-weight: bold;
    }

    p.thicker {
      font-weight: 900;
    }
  </style>
</head>

<body>
  <p class="normal">This is a paragraph.</p>
  <p class="light">This is a paragraph.</p>
  <p class="thick">This is a paragraph.</p>
  <p class="thicker">This is a paragraph.</p>
</body>

</html>
        