RE: Conforming alternative for mobile should not be Desktop

From: David MacDonald [mailto:david100@sympatico.ca]
Sent: Tuesday, June 28, 2016 3:44 PM

I think Jason had the fundamental question right. The small screen view has a different functionality from the large screen view, so I'm suggestiing we add a note 8  to the definitkon o Conforming alternative.

conforming alternate version

1.    conforms at the designated level, and

2.    provides all of the same information and functionality<https://www.w3.org/TR/WCAG20/#functiondef> in the same human language<https://www.w3.org/TR/WCAG20/#human-langdef>, and
...
<add> Note 8: If pages that are optimized for small screen have different functionality from pages optimized for large screen, such as a changed menu mechanism, or less content, or simplified interface, etc. the two views do not have the same functionality and therefore cannot be used as conforming alternatives for each other.</add>

[Jason] Arguably this example illustrates the requirement without changing it, which I expect is what was intended. “Less information” and “simplified interface” (if some functionality is missing from the simpler version) would both qualify as different content and function. A different menu mechanism might, or might not qualify depending on what the differences precisely are.

Thus the question is whether we have a disagreement here about what changes are sufficient to prevent a version from qualifying as a “conforming alternate version” for WCAG purposes. I would suggest clarifying the list of differences in the note.


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