Should I put the <form> tag inside the <table> tag? Or vice versa? It works either way, so does it really matter?

Thanks

If you have your form inside a table, it's probably better style to put it inside the table tag (easier to find it, etc.). But I don't think it matters much.

<form> outside of table.
Depending on the browser sometimes it can cause unexplained white spaces. Just put what you need inside of the table tags.

Actually the white space issues can be solved by putting the <form> and </form> between <table> and <tr> and </td> and </table>

It's works find, however you'll find it won't validate correctly in the W3 validator.