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Decision on CfC: CSS Filters Comment Request

From: Janina Sajka <janina@rednote.net>
Date: Tue, 18 Dec 2018 14:59:26 -0500
To: public-apa-admin@w3.org
Cc: W3C WAI Accessible Platform Architectures <public-apa@w3.org>
Message-ID: <20181218195926.GB8160@rednote.net>
Colleagues:

This Call for Consensus received only responses supporting the proposal
and is therefore agreed as a consensus decision of APA.

The head of thread for this CfC can be found at:

http://lists.w3.org/Archives/Public/public-apa-admin/2018Dec/0003.html

Best,

Janina

Janina Sajka writes:
> Colleagues:
> 
> This is a Call for Consensus (CfC) to the Accessible Platform
> Architectures (APA) Working Group on a proposed Accessibility
> Considerations Section request to the CSS Working Group.
> 
> **Suggested Comment**
> 
>  The Accessible Platform Architectures (APA) Working Group requests addition of the following section to the specification Filter Effects Module Level 1 
> https://www.w3.org/TR/filter-effects-1/ <https://www.w3.org/TR/filter-effects-1/>
> 
> Accessibility Considerations Statement 
> 
> In addition to standard WCAG 2.1 requirements for images, content authors using filter effects should be mindful of how the filters modify the colors, contrast, size, and animation of images.  The following Level A and AA success criteria could be affected:
> 
> *Success Criterion 1.4.1 Use of Color (https://www.w3.org/TR/WCAG21/#use-of-color <https://www.w3.org/TR/WCAG21/#use-of-color>). Given a button shaped as an arrow with the text, “next,” a filter could modify the background color so that the text is no longer visible. 
> *Success Criterion 1.4.3 Contrast (minimum) https://www.w3.org/TR/WCAG21/#contrast-minimum <https://www.w3.org/TR/WCAG21/#contrast-minimum>). Given the example above, a filter could modify the background or text color(s) so  color contrast requirement is not longer met.  
> *Success Criterion 1.4.11 - Non-text Contrast (https://www.w3.org/TR/WCAG21/#non-text-contrast <https://www.w3.org/TR/WCAG21/#non-text-contrast>). Given the example above, a filter could modify the colors so that the contrast between the text and button color, and/or the button color and background no longer meet color contrast requirements. 
>     It is particularly important to be mindful of color contrast  requirements when a transparency is present because automated measurement is not available to quantitatively and correctly judge whether sufficient contrast is being provided, thus requiring application of informed human judgement on a case by case basis.
> *Success Criterion 2.3.1 Three Flashes or Below Threshold (https://www.w3.org/TR/WCAG21/#three-flashes-or-below-threshold <https://www.w3.org/TR/WCAG21/#three-flashes-or-below-threshold>)  Beware of any filters that add animation that may add or change the flash rate. 
> 
> *       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, Monday 17 December.
> 
> NOTE: This Call for Consensus is being conducted in accordance with the
> APA Decision Policy published at:
> 
> http://www.w3.org/WAI/APA/decision-policy
> 
> Thanks to Becky Gibson for drafting this comment.
> http://lists.w3.org/Archives/Public/public-apa/2018Dec/0010.html
> 
> 
> ------------------------------------------------------------------------------
> 
> 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
> 

-- 

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, 18 December 2018 19:59:50 UTC

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