Re: Browser setting to prevent movement

Having had no responses so far I propose that if no objections are raised
in the next 7 days the CSS A11Y TF will begin investigating this idea with
the APA WG.

Thanks,

Ian.

On 7 February 2018 at 16:17, Ian Pouncey <w3c@ipouncey.co.uk> wrote:

> Hello all,
>
> As part of a review of CSS Animations Level 1
> <https://www.w3.org/TR/css-animations-1/> and CSS Transforms Module Level
> 1 <https://www.w3.org/TR/css-transforms-1/>, the APA Working Group
> identified a potential gap that could be filled by the various
> specifications that deal with movement of any kind.
>
> WCAG 2.0 Success Criterion 2.2.2 Pause, Stop, Hide states that:
>
> For moving, blinking, scrolling, or auto-updating information, all of the
>> following are true:
>>
>>    - *Moving, blinking, scrolling*
>>
>>
>>    - For any moving, blinking or scrolling information that (1) starts
>>    automatically, (2) lasts more than five seconds, and (3) is presented in
>>    parallel with other content, there is a mechanism for the user to pause,
>>    stop, or hide it unless the movement, blinking, or scrolling is part of an
>>    activity where it is essential;
>>
>>
>>    - *Auto-updating*
>>
>>
>>    - For any auto-updating information that (1) starts automatically and
>>    (2) is presented in parallel with other content, there is a mechanism for
>>    the user to pause, stop, or hide it or to control the frequency of the
>>    update unless the auto-updating is part of an activity where it is
>>    essential.
>>
>> The APA thinks that there would be a benefit to having a single
> in-browser mechanism for pausing or preventing the playing of any and all
> animation, including that authored with CSS, animated GIFs, and Video
> content.
>
> We'd like to open this discussion to the wider CSS A11Y task force. A
> number of questions come to mind. Is this idea reasonable? Is it likely to
> be implemented by browser vendors? Could the prefers-reduced-motion media
> feature <https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion>
> be used as the basis for such a feature? Could this work without requiring
> action by the author? Is this something that should be included in the
> various CSS modules that deal with movement or animation of some sort.
>
> Thanks in advance for any thoughts or feedback.
>
> Ian.
>