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In page Byte order mark:

"

A BOM is unnecessary for detecting UTF-8 encoding.[citation needed] UTF-8 is a sparse encoding: a large fraction of possible byte combinations do not result in valid UTF-8 text. Binary data and text in any other encoding are likely to contain byte sequences that are invalid as UTF-8, so existence of such invalid sequences indicates the file is not UTF-8, while lack of invalid sequences is a very strong indication the text is UTF-8. Practically the only exception is text containing only ASCII-range bytes, as this may be a non-ASCII 7-bit encoding, but this is unlikely in any modern data and even then the difference from ASCII is minor (such as changing '\' to '¥').