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* Some glyphs used for style (*-Bold, *-Italic, *-BoldItalic) and mathvariant (Mathematical Alphanumeric Symbols unicode block for Bold, Italic, Bold Italic, Bold Script, Bold Fraktur, Sans Serif Bold, Sans Serif Italic, Sans Serif Bold Italic) are probably duplicate. Currently our Python script preserves all the glyphs while MathJax only needs a subset of them to implement the MathML mathvariant and style attributes.
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* The symbol at U+1D98 seems to be incorrect.
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* The symbol at U+1D98 (LATIN SMALL LETTER ESH WITH RETROFLEX HOOK) seems to be incorrect. It appears to be the glyph for U+1D9B (MODIFIER LETTER SMALL TURNED ALPHA)?
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* The combining characters in the larger sizes (found in STIXMath-Regular.otf) do not combine (they are not zero width), as they do in the normal sized versions. E.g., uni20D7.s1 should have right and left bearing both set at 0, with the glyph extending to the left of 0 (see U+20D7 in STIX-Regular.otf for reference). This is true of all the combining characters in size 1 thorough 5 in both Combining Diacritical Marks (U+0300 through U+036F except for U+0338) and Combining Diacritical Marks for Symbols (U+20D0 to U+20FF).
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* The combining symbols U+20EC (COMBINING RIGHTWARDS HARPOON WITH BARB DOWNWARDS) and U+20ED (COMBINING RIGHTWARDS HARPOON WITH BARB DOWNWARDS) in STIX-Italic.otf both combine to the right rather than to the left. That is, they are properly zero width, but the glyph is to the right of 0 rather than to the left. The bold and regular forms are properly handled.
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Note on the design of the Web fonts: splitting the fonts will require some changes like dropping the Open Type Math table, adding space characters for monospace, moving non-Unicode glyphs to the Plane0 PUA etc In general the splitting is designed for MathJax's purpose and may not work well in browsers. Anyway, browsers could just use WOFF packaging of the STIX-Word, without further modifications.
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