Re: 48-Hour Call for Consensus (CfC): New APA Charter

+1

Janina Sajka writes:
> Colleagues:
> 
> This is a Call for Consensus (CfC) to the Accessible Platform
> Architectures (APA) Working Group on a new Charter for our WG. As you
> know, our current Charter will expire at the end of July, and the first
> step in the renewal process is for us to agree on the Charter proposal
> we would offer to W3C.
> 
> Having discussed a new Charter over the past several months, our
> proposed new Charter draft can be found here:
> 
> https://www.w3.org/2018/03/draft-apa-charter.html
> 
> It is hereby proposed to forward this draft Charter as our proposal of
> work for the coming 3-year Charter period.
> 
> 
> *       ACTION TO TAKE
> 
> This CfC is now open for objection, comment, as well as statements of
> support via email. Silence will be interpreted as support, though
> messages of support are certainly welcome.
> 
> If you object to this proposed action, or have comments concerning this
> proposal, please respond by replying on list to this message no later
> than 23:59 (Midnight) Boston Time, Tuesday 15 May.
> 
> Janina
> 
> ------------------------------------------------------------------------------
> 
> Janina Sajka
> 
> Linux Foundation Fellow
> Executive Chair, Accessibility Workgroup: http://a11y.org
> 
> The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
> Chair, Accessible Platform Architectures http://www.w3.org/wai/apa
> 

>    Here is my proposed feedback to the Timed Text Working Group:
> 
> 
>    <draft-feedback>
> 
> 
>     1. While we appreciate that [1]TTML Profiles for Internet Media
>        Subtitles and Captions 1.1 is depending on [2]Timed Text Markup
>        Language 2 (TTML2), it should still include an introduction that
>        guides the reader to a better understanding of its content.  Such
>        an introduction could respond to the following questions:
> 
>     a. Why are profiles needed for text-only and image-only
>        captions/subtitles?
>     b. What are typical use cases for a image-only captions/subtitles?
>     c. What is the purpose of a presentation processor, and a
>        transformation processor?
> 
> 
>     2. There is a general issue with the way that an author specifies
>        layout characteristics of captions and subtitles, such as font
>        size, font family, line height, background and positioning.  The
>        spec describes the approach of the author specifying a “fixed
>        layout” for captions and subtitles that the user cannot change.
>        However, it must be possible for the user to overwrite the author’s
>        choice of font size, or background color, for example. This is
>        necessary for accessibility reasons, in the same way that browsers
>        allow the user to change font size and background color.  How can
>        we find a good solution for these conflicting interests between
>        author and user?  We would like to get into a discussion with you
>        on this issue.
> 
> 
>     3. Section 2 Documentation Conventions (applies also to [3]Timed Text
>        Markup Language 2 (TTML2) section 2.3). For accessibility of the
>        spec, information such as whether an element is deprecated or
>        obsoleted should not be indicated by color (or background color)
>        alone (cf. [4]WCAG 2.0 SC 1.4.1).
> 
> 
>     4. Section 5.1 General. The method of associating a text profile
>        document instance with an image profile document instance should be
>        specified for interoperability reasons, and not be left open to the
>        specific implementation.  Also, the association should be in both
>        ways, i.e. also from the image profile document instance to the
>        text profile document instance.
> 
> 
>     5. Section 6 Supported Features and Extensions. All font-related
>        features are prohibited for the image profile. This seems to be an
>        unnecessary restriction if the image profile contains images in SVG
>        format which could be rendered differently based on the author’s
>        choice of font characteristics.
> 
> 
>     6. Section 7.7.3 itts:forcedDisplay. This seems like a temporary
>        solution. Wouldn’t it be better to define semantic layers of
>        information that each could be made visible and invisible at
>        runtime as appropriate for the user?  For example, the user may
>        want to see either speech-only (subtitles), narration speech only
>        (parts of subtitles), foreign-language speech-only (parts of
>        subtitles) or any combination of them.
> 
> 
>     7. Section 7.7.4 itts:altText.  While we see this feature as useful
>        for accessibility purposes, it should be mandatory for images
>        rather than recommended only. As mentioned in the spec, one could
>        take the pertaining text passage from the text profile document
>        instance – but (1) an accompanying text profile is not required,
>        and (2) the alternative text for the image could be different from
>        the textual caption. Therefore, the itts:altText element should
>        always be specified, but it should be empty for decorative images
>        (not clear if a “decorative image” used as a caption makes sense
>        anyway). By requiring an itts:altText for every image, but allowing
>        for an empty element in case of a decorative image, we would align
>        it with the alt attribute in HTML5 for images.
> 
> 
>    </draft-feedback>
> 
> 
>    Best regards,
> 
>    Gottfried
> 
> 
>    -----Ursprüngliche Nachricht-----
>    Von: Accessible Platform Architectures Working Group Issue Tracker
>    [mailto:sysbot+tracker@w3.org]
>    Gesendet: Mittwoch, 18. Oktober 2017 09:29
>    An: public-apa@w3.org
>    Betreff: apa-ACTION-2152: Review ttml profiles for internet media
>    subtitles and captions 1.1 https://www.w3.org/tr/ttml-imsc1.1/
> 
> 
>    apa-ACTION-2152: Review ttml profiles for internet media subtitles and
>    captions 1.1 [5]https://www.w3.org/tr/ttml-imsc1.1/
> 
> 
>    [6]http://www.w3.org/WAI/APA/track/actions/2152
> 
> 
>    Assigned to: Gottfried Zimmermann
> 
> References
> 
>    1. https://www.w3.org/TR/ttml-imsc1.1/
>    2. https://www.w3.org/TR/ttml2/
>    3. https://www.w3.org/TR/ttml2/
>    4. https://www.w3.org/WAI/WCAG20/quickref/#visual-audio-contrast-without-color
>    5. https://www.w3.org/tr/ttml-imsc1.1/
>    6. http://www.w3.org/WAI/APA/track/actions/2152


-- 

Janina Sajka

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup: http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair, Accessible Platform Architectures http://www.w3.org/wai/apa

Received on Tuesday, 15 May 2018 22:04:56 UTC