Nested Forms Acceptable?
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I can't find anything in the [HTML5 doc](http://www.w3.org/TR/html5/forms.html#the-form-element) 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](http://www.w3.org/TR/html401/cover.html#minitoc) doesn't mention it. *Perhaps it's been permitted all along and I was adhering to old standards.*

Previous Mentions
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[XHTML1.0](http://www.w3.org/TR/xhtml1/#prohibitions)

> 
> form must not contain other form elements.
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[HTML 3.0](http://www.w3.org/MarkUp/html3/forms.html)

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