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Let's try to remove it before Chrome starts supporting and we are forced to support it forever. This is the last IBM (or DOS/OEM) encoding left in the spec.
Is it removed from Gecko?
Not yet. Filed a Gecko bug.
Per http://lists.w3.org/Archives/Public/www-international/2014JulSep/0177.html Chrome implements this. I think this will be WONTFIX then.
All browsers support this encoding now. No longer sufficient justification for any removal attempts.