Parsley.js strange behavior

Question

I am building a registration form using parsley and I found that this code works:

<form  data-validate="parsley" id="registration_form" action="register.php" method="POST">

  <label>Full name:</label>
  <input type="text" id="full_name" name="full_name" placeholder="FirstName LastName" data-required="true" data-trigger="keyup" 
 data-regexp="^[A-Za-z ]+$" autofocus="autofocus">


  <label>Email address:</label>
  <input type="email" id="email_addr" name="email_addr" data-required="true" data-type="email" data-trigger="keyup">

But when I put it into table, even a small part of it, it fails to work.

    <table>
<tr><td>
<form  data-validate="parsley" id="registration_form" action="register.php" method="POST">

  <label>Full name:</label>
  <input type="text" id="full_name" name="full_name" placeholder="FirstName LastName" data-required="true" data-trigger="keyup" 
 data-regexp="^[A-Za-z ]+$" autofocus="autofocus">
</td></tr></table>

No errors from browser.

But what I find out is that if I am doing:

<form  data-validate="parsley" id="registration_form" action="register.php" method="POST">

before <table>, it work. However if I insert it (<form ...>) inside <td></td>, it fails.

As far as I know <form> tag is opened until </form> tag is given or until the end of document. Is it terminated asap parent tag is terminated? Can you explain what is my error?