A simple DTD-driven HTML parser. The parser reads an
HTML file from an InputStream and calls various methods
(which should be overridden in a subclass) when tags and
data are encountered.
Unfortunately there are many badly implemented HTML parsers
out there, and as a result there are many badly formatted
HTML files. This parser attempts to parse most HTML files.
This means that the implementation sometimes deviates from
the SGML specification in favor of HTML.
The parser treats \r and \r\n as \n. Newlines after starttags
and before end tags are ignored just as specified in the SGML/HTML
specification.
The html spec does not specify how spaces are to be coalesced very well.
Specifically, the following scenarios are not discussed (note that a
space should be used here, but I am using   to force the space to
be displayed):
'<b>blah <i> <strike> foo' which can be treated as:
'<b>blah <i><strike>foo'
as well as:
'<p><a href="xx"> <em>Using</em></a></p>'
which appears to be treated as:
'<p><a href="xx"><em>Using</em></a></p>'
If strict
is false, when a tag that breaks flow,
(TagElement.breaksFlows
) or trailing whitespace is
encountered, all whitespace will be ignored until a non whitespace
character is encountered. This appears to give behavior closer to
the popular browsers.