nsIDOMHTMLDirectoryElement

The nsIDOMHTMLDirectoryElement interface is the interface to a
[X]HTML dir element.

This interface is trying to follow the DOM Level 2 HTML specification:
http://www.w3.org/TR/DOM-Level-2-HTML/

with changes from the work-in-progress WHATWG HTML specification:
http://www.whatwg.org/specs/web-apps/current-work/