Text nodes in the full depth of the sub-tree underneath this
Node, including attribute nodes, into a "normal" form where only structure
(e.g., elements, comments, processing instructions, CDATA sections, and entity
Text nodes, i.e., there are neither adjacent
nodes nor empty
Text nodes. This can be used to ensure that the DOM view
of a document is the same as if it were saved and re-loaded.
Copyright Lodovico Giaretta 2016 --