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The Unicode Standard permits the BOM in UTF-8, [4] but does not require or recommend its use. [5] UTF-8 always has the same byte order, [6] so its only use in UTF-8 is to signal at the start that the text stream is encoded in UTF-8, or that it was converted to UTF-8 from a stream that contained an optional BOM. The standard also does not ...
In some locales UTF-8N means UTF-8 without a byte-order mark (BOM), and in this case UTF-8 may imply there is a BOM. [76] [77] In Windows, UTF-8 is codepage 65001 [78] with the symbolic name CP_UTF8 in source code. In MySQL, UTF-8 is called utf8mb4, [79] while utf8 and utf8mb3 refer to the obsolete CESU-8 variant. [80]
The sentence that starts, “One reason the UTF-8 BOM is not recommended” does not imply that the Unicode standard recommends against using a BOM. It merely means that the Unicode standard does not recommend for using a BOM for UTF-8 and gives an example of why Unicode’s recommendation was formulated the way it is. The Unicode caution may ...
UTF-8 byte order mark, commonly seen in text files. ... after BOM: xml (UTF-8 or other 8-bit encodings) eXtensible Markup Language [29] [65] 3C 00 3F 00 78 00 6D 00
The same character converted to UTF-8 becomes the byte sequence EF BB BF. The Unicode Standard allows the BOM "can serve as a signature for UTF-8 encoded text where the character set is unmarked". [75] Some software developers have adopted it for other encodings, including UTF-8, in an attempt to distinguish UTF-8 from local 8-bit code pages.
For UTF-8, the BOM is optional, while it is a must for the UTF-16 and the UTF-32 encodings. (Note: UTF-16 and UTF-32 without the BOM are formally known under different names, they are different encodings, and thus needs some form of encoding declaration – see UTF-16BE, UTF-16LE, UTF-32LE and UTF-32BE.) The use of the BOM character (U+FEFF ...
Therefore the UTF-8 BOM is the primary reason we still have legacy character sets. Web pages in windows-1252 would display correctly if browsers displayed invalid UTF-8 by translating the individual bytes to the windows-1252 characters, and there would be NO reason for any charset and the default could still be UTF-8.
Such files normally begin with byte order mark (BOM), which communicates the endianness of the file content. Although UTF-8 does not suffer from endianness problems, many Microsoft Windows programs (i.e. Notepad) prepend the contents of UTF-8-encoded files with BOM, [2] to differentiate UTF-8 encoding from other 8-bit encodings. [3]