TTML writer should not output cell units #336
Description
In IMSC, "c" units are only permitted on the ebutts:linePadding property.
Instead TTML writer should allow the user to specify that rh and rw units are used.
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In IMSC, "c" units are only permitted on the ebutts:linePadding property.
Instead TTML writer should allow the user to specify that rh and rw units are used.