Hello Sachi,
RadEditor for ASP.NET AJAX is an XHTML editor and produces XHTML content with its tools.
Although it is not possible to guarantee 100% XHTML compliant content, RadEditor for ASP.NET AJAX provides the following tools, which significantly ease the task of producing valid content:
1) W3C XHTML Validator dialog
2) Out-of-the-box ConvertToXhtml and ConvertFontToSpan enabled client-side filters (performs client-side XHTML conversion)
3) You can use the Content property to obtain the content as XHTML on the server.
4) Modified dialogs and Node Inspector module to facilitate the removal of non-XHTML compliant attributes
Due to the fact that the editor relies heavily on the underlying browser rich-edit module there are a number of issues that can negatively affect XHTML compliance:
1) Use of "FONT" tags
2) Use of "U" tag (for underline)
3) Non-compliant closing of tags, etc.
While the Telerik RadEditor can compensate and automatically convert many of these non-valid tags, the responsibility for producing valid XHTML compliant content is partially on the side of the user. Therefore, we strongly suggest the use of the integrated XHTML Validator dialog for the timely discovery and correction of non-compliant content.
All the best,
Rumen
the Telerik team
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