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Revised Understanding text of 2.6.1 Motion Actuation

From: Detlev Fischer (TK) <detlev.fischer@testkreis.de>
Date: Tue, 20 Feb 2018 18:10:07 +0100
To: public-mobile-a11y-tf@w3.org
Cc: Andrew Kirkpatrick <akirkpat@adobe.com>
Message-ID: <8b9542cf-c0af-7e28-b58c-7d61d1284f34@testkreis.de>
Hi,

I have made a few changes to the Understanding text of 2.6.1 Motion 
Actuation

https://rawgit.com/w3c/wcag21/motion-actuation/understanding/21/motion-actuation.html

First, I have tried to address the note (by Andrew?) that

@@We should clarify that authors may be able to meet this when OS 
settings for control of a particular type of motion allow the user to 
disable the motion detection.

So I have drafted:
"If technologies of the chosen accessibility baseline (e.g. a mobile 
operating system) provide the option to disable the detection of a 
particular type of motion, this success criterion may be met by 
preventing that type of input."

...Which is problematic since content that has motion events as the sole 
means of activating functionality would then no longer offer that 
functionality at all if motion input is turned off on the OS level  - so 
how is this SC met? But maybe I misunderstand.

I have also added to Technique name placeholders:

  * GXXX: Do not use the devicemotion event to activate content
    functionality
  * GXXX: Ensure that alternative means of input exist when using device 
motion sensor input to activate content functionality

The first General Technique (do not use...) seems to require a technical 
check that the devicemotion event is not used. So is this rather a SCR 
Technique (even though it just describes that something is NOT used)?

The second General Technique (alternative means of input...) might be 
better an HTML Technique, since providing pointer and kb-accessible 
controls would be the likely way to offer the alternative means?

Detlev

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Detlev Fischer PhD
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-- 
---------------------------------------------------------------
Detlev Fischer PhD
Testkreis
http://testkreis.de

Telefon: +49-40-43 18 75-25
Mobile: +49-157 57 57 57 45
Fax: +49-40-43 18 75-45
E-Mail: detlev.fischer@testkreis.de

Anschrift: Werderstr. 34, 20166 Hamburg
Amtsgericht Hamburg HRB 58 167
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Received on Tuesday, 20 February 2018 17:11:09 UTC

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