Section 508 Accessibility Error - Calibri ligatures not processing to Adobe Acrobat

Question

Something changed recently in Adobe Acrobat. We witnessed an error with ligatures in a font. The program actually tags the information incorrectly and if you use the reader, it reads the mixed up text.

Calibri ligatures not processing to Adobe Acrobat. This is a recent error.

Bevi Chagnon - PubCom.com · Answer

The root of the problem is Unicode itself: it does not have dedicated codepoints for tt and ti ligatures.

The standardized Unicode ligatures for English/Latin are:

U+FB00	ﬀ	Latin Small Ligature ff
U+FB01	ﬁ	Latin Small Ligature fi
U+FB02	ﬂ	Latin Small Ligature fl
U+FB03	ﬃ	Latin Small Ligature ffi
U+FB04	ﬄ	Latin Small Ligature ffl
U+FB05	ﬅ	Latin Small Ligature Long S T
U+FB06	ﬆ	Latin Small Ligature St

The missing tt and ti ligatures seem to appear with Calibri, which appears to be the only font I've come across that has its own custom ligatures for these 2 combos. They are not standard with the UNICODE set of codepoints.

See this related discussion at StackOverflow https://stackoverflow.com/questions/20193102/prevent-localreport-render-using-calibri-font-ligatures

If you'd like to use the tt and ti ligatures, you'll have to petition the Unicode.org consortium to assign them codepoints. Otherwise, forgetabboutthem.

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