This is the base class upon which all tags are implemented. You are
unlikely to ever subclass this directly. The EmptyTag and
EnclosingTag classes inherit from this class.
Use this class as a subclass for all tags which do not require a
closing tag and therefore do not enclose content. Examples of
standard HTML tags which do not enclose content are <BR> and
<HR>.
A simple wrapper around the string passed in the text
constructor argument which passes that string to the
to_html() method when the object is converted to HTML.