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diff --git a/dom/encoding/localesfallbacks.properties b/dom/encoding/localesfallbacks.properties
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This file contains mappings from languages to legacy encodings for languages
+# that are associated with legacy encoding other than windows-1252 (except
+# Traditional Chinese, which is handled as a special case elsewhere).
+#
+# The keys are language codes without regions. The values are Gecko-canonical
+# encoding labels (not necessarily lower case!).
+#
+# Rules:
+#
+# * Avoid editing this file!
+#
+# * If you do edit this file, be sure to file a spec bug against WHATWG HTML
+#   to keep this file in sync with
+#   http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#determining-the-character-encoding
+#
+# * As an exception to the previous rule, gbk is used instead of GB18030 
+#   until/unless work on http://encoding.spec.whatwg.org/ shows that the former
+#   can be treated as an alias of the latter and our decoder implementation 
+#   has been audited to match the spec.
+#
+# * Use only the language code without a hyphen or anything that would come
+#   after the hyphen.
+#
+# * Don't put windows-1252-affiliated languages here.
+#
+# * Don't put Traditional Chinese here.
+
+ar=windows-1256
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+ba=windows-1251
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+be=windows-1251
+bg=windows-1251
+cs=windows-1250
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23090
+el=ISO-8859-7
+et=windows-1257
+fa=windows-1256
+he=windows-1255
+hr=windows-1250
+hu=ISO-8859-2
+ja=Shift_JIS
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+kk=windows-1251
+ko=EUC-KR
+ku=windows-1254
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+ky=windows-1251
+lt=windows-1257
+lv=windows-1257
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+mk=windows-1251
+pl=ISO-8859-2
+ru=windows-1251
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+sah=windows-1251
+sk=windows-1250
+sl=ISO-8859-2
+sr=windows-1251
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+tg=windows-1251
+th=windows-874
+tr=windows-1254
+# https://www.w3.org/Bugs/Public/show_bug.cgi?id=23089
+tt=windows-1251
+uk=windows-1251
+vi=windows-1258
+zh=gbk