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The <html> tag of the page at http://www.w3.org/TR/html5/ (and its related pages/URLs) has the following @lang: en-US-x-Hixie -x-Hixie is a private-use sub-tag (-x denotes the start of a private-use sub-tag). W3C states [1] that: Private-use subtags do not appear in the subtag registry, and are chosen and maintained by private agreement amongst parties. Because these subtags are only meaningful within private agreements and cannot be used interoperably across the Web, they should be used with great care, and avoided whenever possible. Further, IETF BCP 47 Section 2.2.7 [2] states: 5. No source is defined for private use subtags. Use of private use subtags is by private agreement only. 6. Private use subtags are NOT RECOMMENDED where alternatives exist or for general interchange. See Section 4.6 for more information on private use subtag choice. Given that the HTML spec is public and -x-Hixie seems to be more about vanity than having some functional value, I recommend removing the sub-tag altogether and leaving the @lang as en-us. 1. http://www.w3.org/International/articles/language-tags/Overview.en.php#extension 2. http://tools.ietf.org/html/bcp47#section-2.2.7
*** This bug has been marked as a duplicate of bug 18816 ***
(In reply to Adrian Roselli from comment #0) > -x-Hixie seems to be more about vanity than having some functional value If you took a second to Google it, you would have found out that it's about more than vanity. See http://ian.hixie.ch/bible/english