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See apis/css-regions/NamedFlow for example. See Also link displays "css/atrules/@region"; should display "@region"
Hmm, bizarre. For some reason the Page_Title template and API_Name template are not correctly setting the value to be the last bit of the URL. My guess is that #titleparts (documentation on http://www.mediawiki.org/wiki/Help:Extension:ParserFunctions) doesn't handle @'s in URLs correctly. In this case it should be possible to manually override the Page_Title field in the form to be @region , and it will display correctly elsewhere.
I'm also looking at this for some time now. The odd thing is, everything works OK for similar articles, e.g. css/atrules/@charset. See http://docs.webplatform.org/wiki/Special:Browse/css-2Fatrules-2F@charset Api name is fine there. Looking at http://docs.webplatform.org/wiki/Special:Browse?title=Special%3ABrowse&article=css%2Fatrules%2F%40region it says that Compatibility Table has an improper value, I'm not exactly sure why that is, might be connected to the issue. Digging on...