Is it valid to have a html form inside another html form?

Question

Is it valid html to have the following:

Answer 1

HTML 4.x & HTML5 disallow nested forms, but HTML5 will allow a workaround with "form" attribute ("form owner").

As for HTML 4.x you can:

1. Use an extra form(s) with only hidden fields & JavaScript to set its input's and submit the form.
2. Use CSS to line up several HTML form to look like a single entity - but I think that's too hard.