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The http://www.w3.org/1999/xhtml problem in WordPress Dashboard | by YIXUN | Medium
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61. Create and Validate an XHTML 1.0 Document - XML Hacks [Book]
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http://www.w3.org/1999/xhtml from Michael Featherby on 2009-10-28 (site-comments@w3.org from October 2009)
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PPT - <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-gb" lang="en-gb" > PowerPoint Presentation - ID:737954
Slide0160
