html - Are nested forms valid in HTML5?

Question

Nested Forms Acceptable?

I can't find anything in the HTML5 doc that talks about nested forms. I'm sure it's listed on some page, somewhere (perhaps a changelog), but if not, should I assume that no-mention is the same as acceptable?

Additionally, the HTML4 doc doesn't mention it. Perhaps it's been permitted all along and I was adhering to old standards.

Previous Mentions

XHTML1.0

form must not contain other form elements.

HTML 3.0

There can be several forms in a single document, but the FORM element can't be nested.

Answer 1

The HTML5 document does mention it in the section you link above:

Content model

Flow content, but with no form element descendants.

"Content model" means "what this element may contain". So no, nested forms are not allowed.