Question

Is it possible to nest HTML forms like this

<form name="mainForm">   <form name="subForm">   </form> </form> 

so that both forms work? My friend is having problems with this, a part of the subForm works, while another part of it does not.

Answer 1

In a word, no. You can have several forms in a page but they should not be nested.

From the html5 working draft:

4.10.3 The form element

Content model:

Flow content, but with no form element descendants.