Add support for subscript/superscript text #459
Description
Support for subscript/superscript text was added to IMSC 1.3 Text Profile and satisfies substantial use cases (w3c/imsc#583).
The ttconv model should add the same support.
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Support for subscript/superscript text was added to IMSC 1.3 Text Profile and satisfies substantial use cases (w3c/imsc#583).
The ttconv model should add the same support.