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== Compatibility character types and keywords ==
{{Time-context|section|that may not be current but does not specify which version of Unicode is being referenced|date=June 2018}}
The compatibility decomposition property for the 5,402 Unicode compatibility characters{{when}} includes a keyword that divides the compatibility characters into 17 logical groups. Those characters with a compatibility decomposition but without a keyword are termed canonical decomposable characters and those characters are not compatibility characters. Keywords for compatibility decomposable characters include: <initial>, <medial>, <final>, <isolated>, <wide>, <narrow>, <small>, <square>, <vertical>, <circle>, <noBreak>, <fraction>, <sub>, <super>, and <compat>. These keywords provide some indication of the relation between the compatibility character and its compatibility decomposition character sequence. Compatibility characters fall in three basic categories:
# Characters corresponding to multiple alternate glyph forms and precomposed diacritics to support software and font implementations that do not include complete Unicode text layout capabilities.
# Characters included from other character sets or otherwise added to the UCS that constitute [[formatted text|rich text]] rather than the plain text goals of Unicode.
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