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Question F81 note at end of examples will lead to F2 failure

From: Sailesh Panchang <spanchang02@yahoo.com>
Date: Sat, 22 Oct 2016 13:26:26 +0000 (UTC)
To: WCAG <w3c-wai-gl@w3.org>
Message-ID: <1430637722.177289.1477142786766@mail.yahoo.com>
The note reads:
" Note: In both examples, the color could be used without failure if the text was sufficiently different in visual presentation (e.g. bold or in a different
font) that it would be easily differentiated from the surrounding text if the color were removed. It would also not fail if the color chosen had sufficient
luminosity difference (lightness) from the other text that it would be easily be seen as different if viewed in black and white. In these cases - the information
would not be displayed in color (hue) alone but also in "presentation" or "lightness" respectively". 

Agreed, the difference may  not be conveyed via color but it is suggesting some semantics or info relationship that is not available via text or programmatic determinable markup. 
That note in the context of the preceding example will allow a developer to use other presentation effect in place of color. Indeed no user, PWD or not, can be 100% sure that the field is mandatory and that is what the color or presentation difference indicates because it is ambiguous to users in general if I may borrow the phrase from SC 2.4.4.

That note  at the end of F81 examples will lead to 
F2: Failure of Success Criterion 1.3.1 due to using changes in text presentation to convey information without using the appropriate markup or text

I suggest the placement of the note be reviewed  and perhaps be withdrawn to prevent content authors down  a pitfall.

Thanks,
Sailesh Panchang
Received on Saturday, 22 October 2016 13:26:55 UTC

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