The Document interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data. <P> Since elements, text nodes, comments, processing instructions, etc. cannot exist outside the context of a Document ...
The DOMImplementation class is description of a particular implementation of the Document Object Model. As such its data is static, shared by all instances of this implementation. <P> The DOM API requires that it be a real object rather than static methods. However, there's nothing that says ...