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Each HTML document on xml.netbeans.org is generated from XML document. It is because each page contains top bar for better navigation between sub-modules pages. It is not too comfortable to write XML document. If you want to see eventual HTML page, you have to regenerate it. Implement some framework to support written HTML files (probably xhtml) and generate from it HTML with top bar.
XSLT script xml/www/styles/external2page.xsl Look at xml/www/user/guide/*.html and xml/www/user/guide/original/*.html.