[imsc] NBG(R_i) counts transparent backgrounds (#570)

palemieux has just created a new issue for https://github.com/w3c/imsc:

== NBG(R_i) counts transparent backgrounds ==
The quantity NBG(R<sub>i</sub>) counts `tts:backgroundColor` attributes even when the color is transparent, which should result in no drawing.

`tts:backgroundColor` with transparent colors should be ignored.

Please view or discuss this issue at https://github.com/w3c/imsc/issues/570 using your GitHub account


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Received on Wednesday, 2 June 2021 18:42:32 UTC