On Wed, 12 Aug 2009 12:52:38 +0200, Remco <remc...@gmail.com> wrote:
On Wed, Aug 12, 2009 at 10:57 AM, Philip Jägenstedt<phil...@opera.com>
wrote:
Before suggesting any changes to the <source> element, make sure you
have
read
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#concept-media-load-algorithm
Put simply, the handling of <source> is already quite complex,
overloading
it with completely different meanings is not a good idea. <video> won't
handle "text/html" as a source, but if you want different media files
for
different audiences I suggest experimenting with <source media>.
<source media> doesn't do anything useful for my case. It can't load
textual data. Also, if the resources are unavailable, there will be
nothing to see, since all resources are off-page. It also doesn't work
for iframe, object, embed or img.
Is it really the idea that the only way you're going to have
alternative textual content, is to Build It Yourself? You have to
abuse <details> or a hidden <div> with some Javascript to build a
construction that has alternative content in case the
video/audio/iframe/object/embed is not available or desirable. If you
want it to be semantically accessible, you even have to build another
layer on top of that, in the form of ARIA attributes.
No, in the long term we want native captions/subtitle support in the
browsers. See
http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2009-July/021658.html
and maybe http://lists.w3.org/Archives/Public/public-html/2009Aug/0439.html
Nobody will do that. Even the <source> solution is harder, maybe too
hard, to use than the alt="" solution. It requires authors to create
additional elements or pages to house the alternative content. Since
accessibility is often an afterthought, about the most an author will
be willing to do, is filling in an alt attribute.
What do you suggest a browser do with the alt attribute? The resource
selection algorithm never ends until a suitable source is found, so when
should the alt text be displayed? By requiring anything at all, browsers
can't do things like display a box with a direct download link, suggestion
to install a specific codec, etc. If nothing at all is required of user
agents for the alt attribute, then I have no opinion (but then I expect no
one would use it either).
--
Philip Jägenstedt
Core Developer
Opera Software
