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Take for instance this XHTML snippet:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>A webpage</title> </head> <body> <p> <form action="something.php" method="get"> <input type="submit" value="Hello"/> </form> </p> </body> </html> The tree should be valid, however this won't parse correctly in a browser.
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No, nested forms are forbidden. This means A FORM has a mandatory start tag, mandatory end tag and can contain anything in %block or SCRIPT, except other FORMs.
There can be several forms in a single document, but the FORM element can't be nested.
Not it is not, p is a block element, but cannot contain other block elements, only inline ones.
The form tag is used to delimit the start and stop of a form element and serves as a container for form controls (fields). Control is a technical term which refers to the various elements that can be used inside a form to gather information.
Look at the error messages that you get when you try that with http://validator.w3.org
Apart from a warning that you haven't specified a character encoding (and that it's therefore assuming UTF-8), the main error is that a <p> isn't allowed to contain non-inline content. You can either remove the <p> and </p> completely, or, move them inside the <form>.
As for 'why', it's because that's how it's defined in the schema which defines what is and what is not valid XHTML. If you look at this section of the XHTML definition you'll see that <p> is only allowed to contain text or 'inline' (not 'block') tags. However a <form> counts as 'block' content not as 'inline' content.
In other words, a form can contain paragraphs, but a paragraph cannot contain forms.
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According to this, because:
Line 8, Column 44: document type does not allow element "form" here; missing one of "object", "ins", "del", "map" start-tag ✉ The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "p" or "table") inside an inline element (such as "a", "span", or "font").
Line 9, Column 40: document type does not allow element "input" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag input type="submit" value="Hello" The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "p" or "table") inside an inline element (such as "a", "span", or "font").
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