edit-on Pro 4 is a cross-platform in-browser WYSIWYG XHTML/XML editor, which complements web-based Content Management, Knowledge Management, and e-Learning systems and streamlines the process of in-browser Web authoring across platforms without installation of client-side software. It includes CSS support, table editing, a spelling checker, multi-language support and features an API that allows full customization and seamless integration into web-based applications. edit-on Pro guarantees XHTML compliance of the contents created or pasted from other applications by validation. Thus content can easily be parsed and automatically be transformed using XSLT. The focus for improvements in the most recent release was on the filtered copy and paste of Microsoft Word contents, increased performance as well as extended table and WebDAV functionality.