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Feedback by Addison Phillips from W3C I18N group: http://lists.w3.org/Archives/Public/public-tt/2015Mar/0067.html I18N comment: https://www.w3.org/International/track/issues/435 3.2 Text track regions, scroll value http://www.w3.org/TR/2014/WD-webvtt1-20141111/#h3_text-track-regions --- Up Indicates that the cues in the region will be added at the bottom of the region and push any already displayed cues in the region up until all lines of the new cue are visible in the region. --- If the text is set vertically, should the push be ltr/rtl, rather than up?
Bug 24896 is related.
do we need directionally-neutral synonyms for some of our terms (e.g. 'up')?
I'm actually curious to hear from the I18N group to hear if scrolling captions are used for vertically rendered captions.
> do we need directionally-neutral synonyms Ideally, yes, but you can also describe the behavior is that's too disruptive. We generally recommend start/end (for left/right) and before/after (for top/bottom) > I'm actually curious to hear from the I18N group to hear if scrolling > captions are used for vertically rendered captions. Oddly, I happened to see an example recently--it was a historical use in a Japanese film, so not an implementation. Due to the orientation of most screens displaying this type of text and the relative novelty of dynamic vertical support in computer displays, it has to be rare. That said, if you provide the other trappings of vertical presentation, you probably should be complete.
(In reply to Addison Phillips from comment #4) > > do we need directionally-neutral synonyms > > Ideally, yes, but you can also describe the behavior is that's too > disruptive. We generally recommend start/end (for left/right) and > before/after (for top/bottom) Caption text lines can't scroll "before" - they scroll "up" for horizontal text. What would it be for vertical text - it doesn't scroll "start" or "end either. I think it probably would need to scroll "left" for ltr and "right" for rtl - would you agree? > > I'm actually curious to hear from the I18N group to hear if scrolling > > captions are used for vertically rendered captions. > > Oddly, I happened to see an example recently--it was a historical use in a > Japanese film, so not an implementation. > > Due to the orientation of most screens displaying this type of text and the > relative novelty of dynamic vertical support in computer displays, it has to > be rare. That said, if you provide the other trappings of vertical > presentation, you probably should be complete. Looks like we need to do it.
I need to discuss this issue with koji
Since scrolling is currently onmly defined for regions, and regions are currently only used for horizontal text, and scrolling vertical cues seem to be rare, I suggest we continue to define scrolling as defined for horizontal cues only, and defer vertical scrolling to a future version, based on demand from the field. "Only defined for horizontal cues: indicates that the cues in the region will be added at the bottom of the region and push any already displayed cues in the region up until all lines of the new cue are visible in the region."
Addison, are you ok to leave vertical scrolling caption to a next version of WebVTT?