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W3C Markup Validator v1.2 with Verbose Output reports the Content-Type for web page <http://jasonsmath.com/> as "text/html"; whereas Mozilla Firefox Version 3.6.16 (via right-click anywhere in the web page [context menu] -> View Page Info) shows the Type to be "application/xhtml+xml". Using other debugging/display tools, I believe Firefox to be correct and the W3C Markup Validator to be wrong. The anomaly shows up on MS Windows 7 and Fedora 14 Linux, hence "All" OS was selected.
Created attachment 977 [details] Two Screen Shots Showing W3C Markup Validator and Firefox Page Info Output as an ODF Text Document (.odt)
That server seems to deliver different content types to different user agents. Firefox gets application/xhtml+xml indeed, but for example wget, HEAD (from libwww-perl) and the validator get text/html from it: $ wget -S --spider http://jasonsmath.com/ 2>&1 | grep Content-Type Content-Type: text/html $ HEAD http://jasonsmath.com/ | grep Content-Type Content-Type: text/html