The AtomDocument interface

[5]

interface AtomDocument {
  readonly attribute Element? atomFeedElement;
};
Document implements AtomDocument;

[6] On getting, the atomFeedElement attribute of the AtomDocument object MUST perform the following steps:

1. If the document has no document element, return null and abort these steps.
2. If the document element of the document is the feed element in the Atom 1.0 namespace, return the element.