The nsIDOMText interface inherits from nsIDOMCharacterData and represents
the textual content (termed character data in XML) of an Element or Attr.
For more information on this interface please see
http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html
The concatenation of all logically adjacent text nodes with this text
node, where “logically adjacent” consists of all text nodes which can be
reached by traversing the document tree in either direction without
passing an element, comment, or processing-instruction boundary.