ISSUE-442: JIS X 201 vs US-ASCII in ISO-2022-JP

JIS X 201 vs US-ASCII in ISO-2022-JP

Raised by:
Richard Ishida
Opened on:

This issue tracks the bug listed above and was created as part of the WG CR process.



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 ?
Related Actions Items:
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Related emails:
  1. I18N-ISSUE-442 (BUG26886): JIS X 201 vs US-ASCII in ISO-2022-JP [encoding] (from on 2015-03-30)

Related notes:

Bug marked DUPLICATE of

Richard Ishida, 30 Mar 2015, 13:59:49

These issues are now tracked at

Richard Ishida, 16 Sep 2015, 11:54:48

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Addison Phillips <>, Chair, Richard Ishida <>, Fuqiao Xue <>, Atsushi Shimono <>, Staff Contacts
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