Character encodings in HTML: Difference between revisions

Revision as of 19:02, 6 February 2022

Revision as of 12:41, 27 April 2022

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# Explicit user instruction

# An explicit meta tag within the first 1024 bytes of the document

# A [[byte order mark]] (BOM) within the first three bytes of the document

# The HTTP Content-Type or other transport layer information

# Analysis of the document bytes looking for specific sequences or ranges of byte values,<ref>{{cite web| url = http://www.w3.org/TR/html5/syntax.html#prescan-a-byte-stream-to-determine-its-encoding| title = HTML5 prescan a byte stream to determine its encoding}}</ref> and other tentative detection mechanisms.

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* [[EUC-KR]]{{efn|Actually [[Unified Hangul Code]], which is a superset which covers the entire [[Hangul Syllables (Unicode block)|Hangul Syllables]] block.<ref>{{cite web |url=https://encoding.spec.whatwg.org/#index-euc-kr |title=5. Indexes (§ index EUC-KR) |work=Encoding Standard |institution=[[WHATWG]] |last=van Kesteren |first=Anne |author-link=Anne van Kesteren}}</ref>}}

* [[UTF-16BE]]{{efn|Specified for decoding only; form submissions from UTF-16-coded documents are to be encoded in [[UTF-8]].<ref name="outputenc">{{cite web |url=https://encoding.spec.whatwg.org/#output-encodings |title=4.3. Output encodings |work=Encoding Standard |institution=[[WHATWG]] |last=van Kesteren |first=Anne |author-link=Anne van Kesteren}}</ref>}}

* [[UTF-16LE]]{{efn|For compatibility with deployed content, also specified for the plain <code>[[UTF-16]]</code> label,<ref>{{cite web |url=https://encoding.spec.whatwg.org/#utf-16le |title=14.4. UTF-16LE |work=Encoding Standard |institution=[[WHATWG]] |last=van Kesteren |first=Anne |author-link=Anne van Kesteren}}</ref> although a [[Bytebyte Orderorder Markmark]] (BOM), if present, takes priority over any label.<ref>{{cite web |url=https://encoding.spec.whatwg.org/#decode |title=6. Hooks for standards (§ decode) |work=Encoding Standard |institution=[[WHATWG]] |last=van Kesteren |first=Anne |author-link=Anne van Kesteren}}</ref> Specified for decoding only; form submissions from UTF-16-coded documents are to be encoded in [[UTF-8]].<ref name="outputenc" />}}

* x-user-defined{{efn|Maps 0x00 through 0x7F to U+0000 through U+007F, and 0x80 through 0xFF to U+F780 through U+F7FF (a [[Private Use Area]] range), such that the low 8 bits of the code point always match the original byte.<ref>{{cite web |url=https://encoding.spec.whatwg.org/#x-user-defined |title=14.5. x-user-defined |work=Encoding Standard |institution=[[WHATWG]] |last=van Kesteren |first=Anne |author-link=Anne van Kesteren}}</ref>}}

}}{{notelist}}