Description:
------------
When use_trans_sid=on, this will add a hidden field (<input>) right after the form element start tag (<form>).
Problem is that the XHTML Strict DTD forbids inline
elements in the <form> element if they are not enclosed themselves in whatever block elements allowed in <form>, such as <fieldset>, <p>, <div>, etc.


Reproduce code:
---------------
(This is only for illustration purpose).

<form enctype="..." method="..." action="...">
<fieldset>
<legend>Test</legend>
<input accesskey="..." type="text" name="..." />
<input accesskey="2" type="submit" name="test" value="OK" />
</fieldset>
</form>

Expected result:
----------------
(Feature request: the session info should not be added after <form> start tag, but right after first <input> tag, like below in between brackets [ ]).

<form enctype="..." method="..." action="...">
<fieldset>
<legend>Test</legend>
<input accesskey="..." type="text" name="..." />
[<input type="hidden" name="PHPSESSID" value="..." />]
<input accesskey="2" type="submit" name="test" value="OK" />
</fieldset>
</form>

Actual result:
--------------
(This to illustrate the fact that an <input> element (type inline) is not directly allowed in a <form> element by XHTML Strict DTD, although it is permitted by XHTML Transitional DTD).

<form enctype="..." method="..." action="...">[<input type="hidden" name="PHPSESSID" value="..." />]
<fieldset>
<legend>Test</legend>
<input accesskey="..." type="text" name="..." />
<input accesskey="2" type="submit" name="test" value="OK" />
</fieldset>
</form>