设置h1，h2，h3和h4元素文本装饰 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    h1 {
      text-decoration: overline;
    }

    h2 {
      text-decoration: line-through;
    }

    h3 {
      text-decoration: underline;
    }
  </style>
</head>

<body>
  <h1>This is heading 1</h1>
  <h2>This is heading 2</h2>
  <h3>This is heading 3</h3>
</body>

</html>
        