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w3c / mathml-core

MathML Core draft
https://w3c.github.io/mathml-core
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Explain how to handle the "dtls" and "flac" OpenType features #68

Open fred-wang opened 4 years ago

fred-wang commented 4 years ago

From https://docs.microsoft.com/en-us/typography/opentype/spec/math

flac Flattened Accents over Capitals This feature provides flattened forms of accents to be used over high-rise bases such as capitals. This feature should only change the shape of the accent and should not move it in the vertical or horizontal direction. Moving of the accents is done by the math handling client Accents are flattened by the Math engine if their base is higher than MATH.MathConstants. FlattenedAccentBaseHeight.

dtls Dotless Forms This feature provides dotless forms for Math Alphanumeric characters, such as U+1D422 MATHEMATICAL BOLD SMALL I, U+1D423 MATHEMATICAL BOLD SMALL J, U+1D456 U+MATHEMATICAL ITALIC SMALL I, U+1D457 MATHEMATICAL ITALIC SMALL J, and so on. The dotless forms are to be used as base forms for placing mathematical accents over them.

There were experiments in Gecko 6 years ago and dtls is implemented: https://bugzilla.mozilla.org/show_bug.cgi?id=963079

fred-wang commented 2 years ago

IIUC, we decided to move advanced OpenType features to level 2.