Basic to Advance table design in HTML

Example of HTML Basic to Advance table 1
<!DOCTYPE>
<html>
<body>
  <h2>Example of HTML Basic to Advance table 1</h2> 
  <table border="1" bgcolor="lightpink" width="50%" height="250px" style="text-align: center;">
    <tr>
      <th>a
      </th>
      <th>b
      </th>
    </tr>
    <tr>
      <td colspan="2">c
      </td>
    </tr>
</table>
</body>
</html>
Example of HTML Basic to Advance table 2
<!DOCTYPE>
<html>
<body>
<h2>Example of HTML Basic to Advance table 2</h2> 
<table border="1" bgcolor="yellow" width="50%" height="250px" style="text-align: center;">
<tr>
  <th>a
  </th>
  <th>b
  </th>
  <th rowspan="2">c
  </th>
</tr>
<tr>
  <td>d
  </td>
  <td>e
  </td>
</th>
</tr>
<tr>
  <td>f
  </td>
  <td colspan="2">g
  </td>
</th>
</tr>
</table>
</body>
</html>
Example of HTML Basic to Advance table 3
<!DOCTYPE>
<html>
<body>
<h2>Example of HTML Basic to Advance table 3</h2> 
<table border="1" bgcolor="pink" width="50%" height="250px" style="text-align: center;">
<tr>
  <th>a
  </th>
  <th>b
  </th>
  <th rowspan="3">d
  </th>
</tr>
<tr>
  <td colspan="2">c
  </td>
</tr>
<tr>
  <td colspan="2">e
  </td>
</tr>
</table>
</body>
</html>
Example of HTML Basic to Advance table 4
<!DOCTYPE>
<html>
<body>
<h2>Example of HTML Basic to Advance table 4</h2> 
<table border="1" bgcolor="yellow" width="50%" height="250px" style="text-align: center;">
<tr>
  <th>a
  </th>
  <th>b
  </th>
  <th rowspan="2">c
  </th>
</tr>
<tr>
  <td>d
  </td>
  <td>e
  </td>
</tr>
<tr>
  <td colspan="2">f
  </td>
  <td rowspan="2">g
  </td>
</tr>
<tr>
  <td>h
  </td>
  <td>i
  </td>
</tr>
</table>
</body>
</html>
Example of HTML Basic to Advance table 5
<!DOCTYPE>
<html>
<body>
<h2>Example of HTML Basic to Advance table 5</h2>
<table style="border-color: red;" border="1" cellpadding="5" cellspacing="1" width="50%" height="250px">
<tr>
<td bgcolor="green" colspan="2">A
</td>
<td bgcolor="red" rowspan="2">B
</td>
</tr>
<tr>
<td bgcolor="yellow" rowspan="2">D
</td>
<td bgcolor="black" style="color: yellow;"> C
</td>
</tr>
<tr>
<td bgcolor="violate" colspan="2">E
</td>
</tr>
</table>
</body>
</html>