What does 8 and 9lines of my code exactly mean? How does it actually work?

Question

1.<table border="2">
2. <tr>
3. <td>Red</td>
4. <td>Blue</td>
5. <td>Green</td>
6. </tr>
7. <tr>
8.<td><br /></td>
9. <td colspan="2"><br /></td>
10. </tr>
11.</table>

Answer 1

Well the 8th line means that in the column there is a line break .
And in the 9th line you have joined 2 columns with the help of colspan and there is also a line break.
There is no data in both of the columns and the 2nd one is larger as it is joined with the 3rd.
Thanks

Answer 2

They are just closing tags for the table row and the table