Editing Shift JIS (section)

=== Windows-932 / Windows-31J ===
{{Main|Code page 932 (Microsoft Windows)}}

The most popular extension is [[Windows-31J|Windows code page 932]] (a [[CCSID]] also used for [[Code page 932 (IBM)|IBM's extension to Shift JIS]]), which is registered with the [[Internet Assigned Numbers Authority|IANA]] as "Windows-31J",<ref name="iana31j">{{cite web | url=https://www.iana.org/assignments/character-sets/character-sets.xhtml | publisher=IANA | title=Character Sets}}</ref> separately from Shift JIS. This was popularized by Microsoft, although Microsoft itself does not recognize the Windows-31J name and instead calls that variation "shift_jis".<ref name="msdnlabels">{{cite web|url=https://msdn.microsoft.com/en-us/library/system.text.encoding.windowscodepage(v=vs.110).aspx |title=Encoding.WindowsCodePage Property – .NET Framework (current version) |work=MSDN |publisher=Microsoft}}</ref><ref>{{cite web |url=https://docs.microsoft.com/en-us/windows/desktop/intl/code-page-identifiers |title=Code Page Identifiers |publisher=Microsoft |work=Windows Dev Center|date=7 January 2021 }}</ref> IBM's code page 943 includes the same double-byte codes as Microsoft's code page 932, while IBM's code page 932 includes fewer extensions (excluding those which Microsoft incorporates from NEC), and retains the character order from the 1978 edition of JIS X 0208, rather than implementing the [[JIS X 0208#Second standard|character variant swaps]] from the 1983 standard.<ref name="ibm932v943">{{cite web | url=https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.nlsgdrf/ibm-943_ibm-932.htm | title=IBM-943 and IBM-932 | publisher=IBM | work=IBM Knowledge Center}}</ref>

Windows-31J assigns 0x5C to U+005C REVERSE SOLIDUS (the [[backslash]]), and 0x7E to U+007E [[tilde|TILDE]], following [[US-ASCII]].<ref>{{cite web | url=https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP932.TXT | title=CP932.TXT | publisher=Unicode Consortium}}</ref> However, most localised fonts on Windows display U+005C as a [[Yen sign]] for {{nowrap|JIS X 0201}} compatibility.<ref>{{cite web | url=http://www.opengroup.or.jp:80/jvc/cde/ucs-conv-e.html#ch3_1_1 | title=3.1.1 Details of Problems | publisher=The Open Group Japan | work=Problems and Solutions for Unicode and User/Vendor Defined Characters | archive-url=https://web.archive.org/web/19990203115405/http://www.opengroup.or.jp/jvc/cde/ucs-conv-e.html#ch3_1_1 | archive-date=1999-02-03 | url-status=dead }}</ref><ref name="kaplan">{{cite web | title=When is a backslash not a backslash? | date=2005-09-17 | author=Kaplan, Michael S. | url=http://archives.miloush.net/michkap/archive/2005/09/17/469941.html}}</ref> It includes several extensions, namely "[[JIS X 0208#0x2D|NEC special characters]] (Row 13), NEC selection of IBM extensions (Rows 89 to 92), and IBM extensions (Rows 115 to 119)",<ref name="iana31j" /> in addition to setting some encoding space aside for [[Private Use Areas#Private-use characters in other character sets|end user definition]].<ref>{{cite web | url=http://archives.miloush.net/michkap/archive/2007/05/26/2901371.html | title=The PUA outside of Unicode | author=Kaplan, Michael S | work=Sorting it all out | date=2007-05-26}}</ref>

Windows codepage 932 is the version used in the [[W3C]]/[[WHATWG]] encoding standard used by [[HTML5]], which includes the "formerly proprietary extensions from IBM and NEC" from Windows-31J in its table for JIS X 0208,<ref>{{cite web | url=https://encoding.spec.whatwg.org/#index-jis0208 | title=5. Indexes (§ Index jis0208) | publisher=WHATWG | work=Encoding Standard}}</ref> and also treats the label "shift_jis" interchangeably with "windows-31j" with the intent of being "compatible with deployed content".<ref>{{cite web | url=https://encoding.spec.whatwg.org/#names-and-labels | title=4.2. Names and labels | publisher=WHATWG | work=Encoding Standard}}</ref>