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[Bug 10642] No alternative text description for video key frame (poster)

From: <bugzilla@jessica.w3.org>
Date: Tue, 05 Oct 2010 05:18:58 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P2zvW-0003UQ-Uk@jessica.w3.org>

--- Comment #47 from Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no> 2010-10-05 05:18:57 UTC ---
(In reply to comment #43)

> If such a mechanism were to be added, it would be better to use an element
> instead of an attribute, so that the text equivalent can use semantic markup
> and is not limited to plain text.

@Maciej, where would you place the element you have in mind? Inside or outside

Note that Everett's proposal *is* to use an element:

  <poster src=" URI " alt="Alternative description of poster image." />

An advantage to this solution: if the image is unavailable, then the @alt text
could serve as fallback. While it would be nice to allow semantic markup (and
if you have a good solution, then I am all for it), it is allready accepted to
use @alt for image alternative text.

@John: I think there could be a technical advantage to reusing @alt. 
@Ian: Clearly, <video alt="Foo."> could be contrieved, but <poster alt="Foo."/>
shouldn't be.

W.r.t. inside/outside <videeo>:  in bug 10938, I propose an "accessibility
stocking" - an inline element (intitially suggested to be called <textual>)
that can be wrapped around embedding elements: Any textual content inside
<textual> will serve as short alternative text for the video. A <poster/>
element could also be placed inside <textual> as well:

   <poster src=photo.jpg
                 alt="Photo of Putin having caught a Siberian tiger">
    Video footage shot to demo how Russia protects their endagered tigers.
    <video src="vid"></video>

(<textual> could also be placed inside <video>, I guess. However, <video> is
designed to not reveal its content unless the codec isn't working or the the
video resource is unavalailable. Btw, <textual> is also intended to solve the
link-to-transcript problem and link-to-long-description problem.)

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Received on Tuesday, 5 October 2010 05:19:00 UTC

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