Re: What is the use case for two levels of background colors?

Maybe I am off-track here, but to me it seems that the cue box (especially
with an auto width and height) is the logical place for having this
visually stable background. This should work just fine for pop-on captions,
but breaks down with roll-up, because in roll-up, each new line/addition is
a separate cue.

I'm not sure why this decision was made, to have a separate cue of its own
for each new roll-up line, other than the desire to employ WebVTT's overlap
avoidance algorithms. Hypothetically speaking, couldn't the same use cases
be solved with overflow properties on cue boxes? If so, I don't see any
need for regions anymore. What am I missing?

Christian


On Sat, May 10, 2014 at 5:10 PM, Philip Jägenstedt <philipj@opera.com>wrote:

> Thanks David!
>
> If "visual stability" can be important to the end user, what should be
> done in the case where regions aren't used by the caption author? In
> 708, is it possible to have captions outside of windows?
>
> (Note that a VTTRegion background grows and shrinks with the cues
> within it, but it sounds like you had something slightly different in
> mind.)
>
> Philip
>
> On Fri, May 9, 2014 at 10:09 PM, David Singer <singer@apple.com> wrote:
> > I am not sure that they are useful together, but don’t they have
> different visual effects?
> >
> > The background for a region causes a stable rectangular area to be
> painted in that color, no mater what text (if any) is inside it.
> >
> > the background for text is only drawn around the actual characters.
> >
> > the first has the advantage of visual stability, while the second
> minimizes the amount of the scene obscured.
> >
> > On May 9, 2014, at 7:07 , Philip Jägenstedt <philipj@opera.com> wrote:
> >
> >> Hi all,
> >>
> >> Does anyone know the use case for having two levels of background
> >> colors, specifically one background color on the individual lines of
> >> text and another on the region/window?
> >>
> >> The only thing I can think of is that it could make the text more
> >> readable for some people. However, if that is the real use case I
> >> think relying on regions for it is unacceptable, because the author
> >> may not have used regions at all. A robust solution would require the
> >> user agent always add that extra layer behind all cues.
> >>
> >> Thoughts?
> >>
> >> Philip
> >>
> >
> > David Singer
> > Manager, Software Standards, Apple Inc.
> >
>
>


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Christian Vogler, PhD
Director, Technology Access Program
Department of Communication Studies
SLCC 1116
Gallaudet University
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