Bài 1

<h1>Hello, World!</h1>
<h2>Welcome to my website</h2>
<h3>Enjoy your stay!</h3>
<h4>Have a great day!</h4>
<h5>Thank you for visiting!</h5>
<h6>Goodbye!</h6>

<ul>
  <li>Menu 1</li>
  <li>Menu 2</li>
  <li>Menu 3</li>
</ul>
<ol>
  <li>Danh sách 1</li>
  <li>Danh sách 2</li>
  <li>Danh sách 3</li>
</ol>
<ol type="I">
  <li>Danh sách 1
    <ol>
      <li>Menu 1</li>
      <li>Menu 2</li>
      <li>Menu 3</li>
      <li>Menu 4</li>
      <li>Menu 5</li>
    </ol>
  </li>
  <li>Danh sách 2
    <ol start="6">
      <li>Menu 6</li>
      <li>Menu 7</li>
      <li>Menu 8</li>
      <li>Menu 9</li>
      <li>Menu 10</li>
    </ol>
  </li>
</ol>

<a href="https://kietkuny.github.io/info/">Nhấn nút này</a>

<table border="1">
  <tr>
    <td rowspan="3">1</td>
    <td rowspan="2">2</td>
    <td>3</td>
    <td>4</td>
  </tr>
  <tr>
    <td colspan="2">7</td>
  </tr>
  <tr>
    <td colspan="3">10</td>
  </tr>
</table>
<br>
<br>
<br>
<form action="">
  <label>Tên đăng nhập</label>
  <input type="text" name="user">
  <br>
  <label>Mật khẩu</label>
  <input type="password" name="pw">
  <br>
  <label for="">Giới tính</label>
  <br>
  <input type="radio" name="gender">Nam
  <input type="radio" name="gender">Nữ
  <br>
  <input type="checkbox" name="subscribe" id="subscribe">
  <input type="checkbox" name="subscribe" id="subscribe">
  <input type="checkbox" name="subscribe" id="subscribe">
  <button type="submit">Đăng nhập</button>
</form>

Result Size: