ISSUE-142: No alternative text description for video key frame (poster)

poster-alt

No alternative text description for video key frame (poster)

State:

POSTPONED

Product:

pre-LC1 HTML 5 spec

Raised by:

Steve Faulkner

Opened on:

2010-11-12

Description:

bug raised by everett zufelt
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

Issue:

The HTML5 specification does not currently require, or make available a method
to provide, an alternative text description for the poster attribute of the
video element. Authors are able to specify a frame of video, or an image
external to the video, to serve as a "poster". User agents can show this image
while no video is available.

When placing an image in a document using the img element, an alternative text
replacement, using the alt attribute, is required, with the exception of
specific use-cases. It does not appear that the usage of the poster attribute
of the video element fits into any of the use-cases for omitting an alternative
description with an img element, and therefore an alternate description should
be required when authors explicitly set the poster attribute for a video
element.

Proposal:

Move poster from being an attribute of the video element to being a descendant
with at least a src and alt attribute. For example:

<video ...>

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

</video>

References:

http://dev.w3.org/html5/spec/video.html#attr-video-poster

4.8.6 The video element

The poster attribute gives the address of an image file that the user agent can
show while no video data is available.

http://dev.w3.org/html5/spec/embedded-content-1.html#alt

4.8.1.1 Requirements for providing text to act as an alternative for images

4.8.1.1.1 General guidelines

Except where otherwise specified, the alt attribute must be specified and its
value must not be empty; the value must be an appropriate replacement for the
image. The specific requirements for the alt attribute depend on what the image
is intended to represent, as described in the following sections.

HTML5-SPEC-SECTIONS [video]

Related Actions Items:

No related actions

Related emails:

1. RE: FORMAL OBJECTION (RE: Working Group Decision on 142 poster-alt) (from Paul.Cotton@microsoft.com on 2012-10-08)
2. Re: CP, ISSUE-30: Link longdesc to role of img [Was: hypothetical question on longdesc] (from silviapfeiffer1@gmail.com on 2012-03-21)
3. Re: CP, ISSUE-30: Link longdesc to role of img [Was: hypothetical question on longdesc] (from xn--mlform-iua@xn--mlform-iua.no on 2012-03-21)
4. Re: CP, ISSUE-30: Link longdesc to role of img [Was: hypothetical question on longdesc] (from silviapfeiffer1@gmail.com on 2012-03-21)
5. Re: FW: Revised Timeline and New Bug Priority Policy (from rubys@intertwingly.net on 2012-02-28)
6. {agenda} HTML WG telecon 2011-03-31: Issues, Publications, Surveys, Decisions, Task Force Reports (from rubys@intertwingly.net on 2011-03-30)
7. Re: Working Group Decision on 142 poster-alt (from jonas@sicking.cc on 2011-03-29)
8. Re: FORMAL OBJECTION (RE: Working Group Decision on 142 poster-alt) (from rubys@intertwingly.net on 2011-03-29)
9. Working Group Decision on 142 poster-alt (from rubys@intertwingly.net on 2011-03-29)
10. {agenda} HTML WG telecon 2011-03-24: Issues, surveys, decisions (from mjs@apple.com on 2011-03-23)
11. RE: {minutes} HTML WG telecon 2011-03-17: Issues, surveys, decisions and task force reports (from adrianba@microsoft.com on 2011-03-17)
12. {agenda} HTML WG telecon 2011-03-17: Issues, surveys, decisions and task force reports (from Paul.Cotton@microsoft.com on 2011-03-15)
13. ISSUE-142: poster-alt - Straw Poll for Objections (from Paul.Cotton@microsoft.com on 2011-03-11)
14. {minutes} HTML WG telecon 2011-03-10: Action items, issues, surveys and decisions (from Paul.Cotton@microsoft.com on 2011-03-11)
15. {agenda} HTML WG telecon 2011-03-10: Action items, issues, surveys and decisions (from Paul.Cotton@microsoft.com on 2011-03-08)
16. Re: ISSUE-9 video-accessibility: Call for Consensus to close in favor of specific issues, or Alternate/Counter-Proposals (from rubys@intertwingly.net on 2011-03-04)
17. {minutes} HTML WG telecon 2011-03-03: Issues, Decisions, Task Force Reports, and Other Business (from Paul.Cotton@microsoft.com on 2011-03-04)
18. RE: {minutes} HTML WG telecon 2011-03-03: Issues, Decisions, Task Force Reports, and Other Business (from adrianba@microsoft.com on 2011-03-03)
19. {agenda} HTML WG telecon 2011-03-03: Issues, Decisions, Task Force Reports, and Other Business (from rubys@intertwingly.net on 2011-03-02)
20. {minutes} HTML WG telecon 2011-02-24: Action items and Issues (from Paul.Cotton@microsoft.com on 2011-02-24)
21. ISSUE-9 video-accessibility: Call for Consensus to close in favor of specific issues, or Alternate/Counter-Proposals (from mjs@apple.com on 2011-02-24)
22. {agenda} HTML WG telecon 2011-02-24: Action items and Issues (from Paul.Cotton@microsoft.com on 2011-02-23)
23. RE: {minutes} HTML WG telecon 2011-02-03: Issues, survey, A11y TF mini-report, Bug 11984 (from adrianba@microsoft.com on 2011-02-10)
24. Re: ISSUE-142 poster-alt - Chairs Solicit Alternate Proposals or Counter-Proposals (from silviapfeiffer1@gmail.com on 2011-02-04)
25. {minutes} HTML WG telecon 2011-02-03: Issues, surveys (from Paul.Cotton@microsoft.com on 2011-02-03)
26. RE: ISSUE-142 poster-alt - Chairs Solicit Alternate Proposals or Counter-Proposals (from jfoliot@stanford.edu on 2011-02-03)
27. ISSUE-142 poster-alt - Chairs Solicit Alternate Proposals or Counter-Proposals (from mjs@apple.com on 2011-02-03)
28. {agenda} HTML WG telecon 2011-02-03: Issues, surveys (from mjs@apple.com on 2011-02-02)
29. {minutes} HTML WG Telecon 2010-01-27: status of actions, new issues, closing items, new calls, charter status (from Paul.Cotton@microsoft.com on 2011-01-27)
30. {agenda} HTML WG Telecon 2010-01-27: status of actions, new issues, closing items, new calls, charter status (from Paul.Cotton@microsoft.com on 2011-01-26)
31. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from singer@apple.com on 2011-01-26)
32. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from silviapfeiffer1@gmail.com on 2011-01-25)
33. RE: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from jfoliot@stanford.edu on 2011-01-24)
34. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from jackalmage@gmail.com on 2011-01-24)
35. RE: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from jfoliot@stanford.edu on 2011-01-24)
36. RE: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from jfoliot@stanford.edu on 2011-01-22)
37. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from philipj@opera.com on 2011-01-22)
38. RE: {minutes} HTML WG Telecon 2010-01-20: status of actions, calls; task force reports (from adrianba@microsoft.com on 2011-01-20)
39. {agenda} HTML WG Telecon 2010-01-20: status of actions, calls; task force reports (from rubys@intertwingly.net on 2011-01-18)
40. {minutes} HTML WG Telecon 2010-12-16: status of actions, calls, new decisions, task force reports (from Paul.Cotton@microsoft.com on 2010-12-16)
41. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from laura.lee.carlson@gmail.com on 2010-12-16)
42. RE: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from Paul.Cotton@microsoft.com on 2010-12-16)
43. {agenda} HTML WG Telecon 2010-12-16: status of actions, calls, new decisions, task force reports (from Paul.Cotton@microsoft.com on 2010-12-16)
44. {agenda} HTML WG Telecon 2010-12-16: status of actions, calls, new decisions, task force reports (from Paul.Cotton@microsoft.com on 2010-12-15)
45. Re: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from rubys@intertwingly.net on 2010-12-13)
46. RE: ISSUE-142 (poster-alt): Chairs Solicit Proposals (from jfoliot@stanford.edu on 2010-12-13)
47. ISSUE-142 (poster-alt): Chairs Solicit Proposals (from Paul.Cotton@microsoft.com on 2010-12-13)
48. {minutes} HTML WG Telecon 2010-11-18: status of actions, calls, issues, meeting schedule, timeline to LC status (from Paul.Cotton@microsoft.com on 2010-11-21)
49. {agenda} HTML WG Telecon 2010-11-18: status of actions, calls, issues, meeting schedule, timeline to LC status (from Paul.Cotton@microsoft.com on 2010-11-17)
50. ISSUE-142 (poster-alt): No alternative text description for video key frame (poster) [HTML 5 spec] (from sysbot+tracker@w3.org on 2010-11-12)

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