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Bug 19458 introduced 'text-wrap: balance' in CSS Text: http://dev.w3.org/csswg/css-text-4/#valdef-text-wrap-balance Reference this and remove the "Regardless of the value of the 'white-space' property" bit.
Should we leave this for v2 seeing as that spec is still unofficial?
Whatever we do with 'text-wrap: balance' I think we should remove our own steps attempting the same thing, as that isn't something anyone should ever implement. I would like to refer to text-wrap:balance, and if that needs to be removed from /TR/webvtt1/ due to pub rules then so be it.
OK, I believe we can reference unofficial specs until we get much further in the process. So, let's give this a go.
https://github.com/w3c/webvtt/pull/274
Note that this introduces a dependency on CSS Text 4 which is still in editor's draft.