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valid_glyphnames
- Applies to: TTF
- Fontspector can hotfix?: no
- Fontspector can fix sources?: no
Microsoft's recommendations for OpenType Fonts states the following:
'NOTE: The PostScript glyph name must be no longer than 31 characters,
include only uppercase or lowercase English letters, European digits,
the period or the underscore, i.e. from the set [A-Za-z0-9_.] and
should start with a letter, except the special glyph name .notdef
which starts with a period.'
https://learn.microsoft.com/en-us/typography/opentype/otspec181/recom#-post--table
In practice, though, particularly in modern environments, glyph names can be as long as 63 characters.
According to the "Adobe Glyph List Specification" available at:
https://github.com/adobe-type-tools/agl-specification
Glyph names must also be unique, as duplicate glyph names prevent font installation on Mac OS X.
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universal (in section 'Universal Profile Checks')
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googlefonts (in section 'Universal Profile Checks')