![]() It is increasingly common for multilingual websites and websites in non-Western languages to use UTF-8, which allows use of the same encoding for all languages. Finally, browsers usually permit the user to override incorrect charset label manually as well. In Chinese, Japanese, and Korean ( CJK) language environments where there are several different multi-byte encodings in use, auto-detection is also often employed. This presents few problems for English-speaking users, but other languages regularly-in some cases, always-require characters outside that range. ![]() Analysis of the document bytes looking for specific sequences or ranges of byte values, and other tentative detection mechanisms.Ĭharacters outside of the printable ASCII range (32 to 126) usually appear incorrectly.The HTTP Content-Type or other transport layer information.A byte order mark (BOM) within the first three bytes of the document.An explicit meta tag within the first 1024 bytes of the document.An "encoding sniffing algorithm" is defined in the specification to determine the character encoding of the document based on multiple sources of input, including: not a superset of ASCII), such as UTF-16BE and UTF-16LE, a processor of HTML, such as a web browser, should be able to parse the declaration in some cases through the use of heuristics.Īs of HTML5 the recommended charset is UTF-8. For character encodings that are not ASCII extensions (i.e. ![]() If the character encoding is an ASCII extension then the content up to and including the declaration itself should be pure ASCII and this will work correctly. With this second approach, because the character encoding cannot be known until the declaration is parsed, there is a problem knowing which character encoding is used in the document up to and including the declaration itself.
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