At 00:56 +0200 2002-07-19, Adam Twardoch wrote:
>I have a very basic question. What would be the implementation differences
>of diacritics marks in a font? For example, we'd consider:
>
>U+00B4 acute accent

This is a spacing acute accent.

>U+02CA modifier letter acute accent

This is also spacing, and is used to mark tone in some Asian languages.

>U+0301 combining acute accent

This is the one that you can use productively as a nonspacing 
combining diacritic over a, p, x, or letters in other scripts.
-- 
Michael Everson *** Everson Typography *** http://www.evertype.com

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