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Blink (Chrome, Opera) and Webkit with ICU (Safari) distinguish between JIS X 201 ( "ESC ( J") and US-ASCII ( "ESC ( B" ). I thought that Gecko did that, too even though it may have changed its behavior recently to match the spec. Assuming that Gecko did distinguish between the two in the past, what's the rationale for unifying the two given the status of implementations ?
Adding those that know Gecko. Perhaps Opera Presto had this behavior? Or IE?
AFAIK Gecko has always treated JIS X 201 Roman set and US-ASCII as identical (but see the code comment at http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/intl/uconv/ucvja/nsJapaneseToUnicode.cpp&rev=1.2&mark=643-645#634)
It's not entirely clear to me how we want to proceed here.
*** This bug has been marked as a duplicate of bug 27256 ***