Per the 20171109 joint TTWG/CSS meeting
As illustrated at fillLineGap.pdf, a common captioning style requires the background of inline areas to extend to the before-and after-edges of the containing line area. This styling capability is not currently supported by CSS.
This capability mirrors the itts:fillLineGap
styling attribute at https://www.w3.org/TR/ttml-imsc1.0.1/#itts-fillLineGap
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4