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encyclo - 3:49 pm on Apr 2, 2006 (gmt 0)
No, Safari is totally broken, as it does what is called "MIME-type sniffing", ignoring the explicitly-declared This is actually an excellent example of the dangers explained by the article. What would happen if a user agent "did a Safari" and decided to parse all documents with an XHTML doctype as [edited by: encyclo at 3:50 pm (utc) on April 2, 2006]
Ironically, the article referenced in the opening post is totally broken and unreadable in Safari. text/plain MIME and overriding it due to the presence of markup. application/xhtml+xml? The vast majority would break, even the "valid" ones. Of course, any error in a document served as application/xhtml+xml is a fatal error, making the document totally inaccessible.