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In page UTF-8:

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The official name for the encoding is UTF-8, the spelling used in all Unicode Consortium documents. The hyphen-minus is required and no spaces are allowed. Some other names used are:

  • Most standards are also case-insensitive and utf-8 is often used.[citation needed]
  • Web standards (which include CSS, HTML, XML, and HTTP headers) also allow utf8 and many other aliases.[1]