Is it valid HTML to insert a hidden input between table rows?

Question

Background: I am writing a Java app which auto generates a HTML table. As well as adding table rows, this app may insert hidden inputs. However, at present it simply inserts them into the table at the next opportunity, for example:

<table>
    <tr> ... </tr>
    <input type="hidden" />
    <tr> ... </tr>
</table>

So, my question: Is it valid HTML to insert a hidden input between rows like this, or is this likely to cause problems?

Answer 1

It's not valid.

<!ELEMENT TABLE - -
     (CAPTION?, (COL*|COLGROUP*), THEAD?, TFOOT?, TBODY+)>

Answer 2

No, it's not.

You should use the W3C validator and check by yourself your webpages : http://validator.w3.org/.

Answer 3

It's not valid.

From http://validator.w3.org/

Line 9, Column 27: document type does not allow element "input" here