As powerful as tidy already is, the PHP tidy extension also
makes parsing and navigating an HTML document tree a snap!
Tidy allows you to "jump into" a document tree at key
points and from there navigate your way using object constructs
%root()% -- Begin at the start of the document
%head()% -- Begin at the <HEAD> tag
%html()% -- Begin at the <HTML> tag
%body()% -- Begin at the <BODY> tag