form, but it is used only in the context of a child (the element) -> parent (the form) context. Like:
refers the element.
- this is a generic reference of all the forms
which might exist on a document. This is the reason for it is used only as a property of the document
Now, do you sense the difference? You may refer a form from both ends: either from a child element of that form (up from the branch), or from the parent of all the forms: the document
(down to the branch). In the later you need also either the name
of the form, or its position
in the DOM tree.