Xalan. Support in Firefox, Mozilla, and Netscape (all using the TransforMiiX engine) is incomplete. Support of disable-output-escaping does not work which is why HTML Fragments are not rendered properly. This bug is known since 2001 https://bugzilla.mozilla.org/show_bug.cgi?id=98168 . XSL Formatting Objects Support for XSL Formatting Objects is available in a number of products: the XEP package from RenderX has near 100% support for XSL-FO 1.0 XSLFormatter from Antenna House also has near 100% support for the XSL-FO 1.0 specification and has 100% support for all new features within the XSL-FO 1.1 specification XINC from Lunasil has a great amount of support for the XSL-FO 1.0 specification FOP from the Apache project can render a portion of the XSL formatting objects 1.0 specification to PDF XML2PDF Formatting Engine Server from AltSoft has near 100% support for the XSL-FO 1.1 These products support output in a number of file formats, to varying degrees: Portable Document Format PostScript SVG MIF PCL text files XPath XML Path Language (XPath), itself part of the XSL family, functions within XSLT as a means of navigating an XML document. Another W3C project, XQuery, aims to provide similar capabilities for querying XML documents using XPath. References External links tutorial and reference of XSLT and XSL-FO XML Focus Topics: CSS, XSL, XSL-FO IBM XSL Formatting Objects Composer World Wide Web Consortium standards Stylesheet languages Markup languages XML-based standards Computer-related introductions in 1998