The directory associated with the document. For documents read from the file system, this is the directory part of the documentURI attribute, excluding the name, and expressed as a file system path not as a URI. If the document has no directory, for example, a new document created from a template and not yet saved, this is the null string. A document created by calling cloneNode on another Document node inherits this attribute.

This attribute is read-only. However, changing the documentURI attribute will also change the value of the directory attribute.