W3C home > Mailing lists > Public > public-html-a11y@w3.org > November 2010

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

From: <bugzilla@jessica.w3.org>
Date: Sun, 14 Nov 2010 10:07:28 +0000
To: public-html-a11y@w3.org
Message-Id: <E1PHZUe-0005ma-D0@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

--- Comment #73 from Laura Carlson <laura.lee.carlson@gmail.com> 2010-11-14 10:07:24 UTC ---
(In reply to comment #72)
> Yes, but it is also impossible to render two different alternative texts for a
> single element unit. It's not like the <video> element and the poster are two
> separate elements - they are a single entity that is presented to sighted users
> as a single object on screen. How should two different alternative texts for a
> single object even be rendered?

Hi Silvia,

The User Agent Accessibility Guidelines may be helpful:

QUOTE:
Guideline 3.1 Provide access to alternative content.

3.1.1 Identify Presence of Alternative Content The user has the ability to have
indicators rendered along with rendered elements that have alternative content
(e.g. visual icons rendered in proximity of content which has short text
alternatives, long descriptions, or captions). In cases where the alternative
content has different dimensions than the original content, the user has the
option to specify how the layout/reflow of the document should be handled.
(Level A).

3.1.2 Configurable Default Rendering: The user has a global option to specify
which types of alternative content by default and, in cases where the
alternative content has different dimensions than the original content, how the
layout/reflow of the document should be handled. (Level A)

3.1.3 Browse and Render: The user can browse the alternatives, switch between
them, and render them according to the following (Level A):

   1. synchronized alternatives for time-based media (e.g., captions, audio
descriptions, sign language) can be rendered at the same time as their
associated audio tracks and visual tracks, and
   2. non-synchronized alternatives (e.g., short text alternatives, long
descriptions) can be rendered as replacements for the original rendered
content.

3.1.4 Rendering Alternative (Enhanced): Provide the user with the global option
to configure a cascade of types of alternatives to render by default, in case a
preferred type is unavailable. If the alternative content has a different
height or width, then the user agent will reflow the viewport. (Level AA)
UNQUOTE

http://www.w3.org/TR/UAAG20/#principle-perceivable

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Received on Sunday, 14 November 2010 10:07:30 GMT

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