The Javadoc for HtmlParser states: 
"By default, when using the constructor without arguments, the this parser coerces XML 1.0-incompatible infosets into XML 1.0-compatible infosets. This corresponds to <code>ALTER_INFOSET</code> as the general XML violation policy."

Yet the default default constructor looks like this:
    /**
     * Instantiates the parser with a fatal XML violation policy.
     *
     */
    public HtmlParser() {
        this(XmlViolationPolicy.FATAL);
    }

I believe these two statements are in conflict.