Evaluating success criteria to false

[Chaals Nevile]

According to WCAG 2.X, "satisfies a success criterion" means "the
success criterion does not evaluate to 'false' >when applied to the
page"

Beyond using a WCAG Working Group published common failure, what is
necessary and sufficient for a success >criterion to evaluate to false?

Basically, a sound argument that the content failed to achieve the stated
requirements.

The failure techniques are merely cases that are common enough that they
were recognised by the guidelines working group and the argument was
agreed to be sound enough and repeatable enough that they wrote it down so
you don't have to do as much work.

For example, looking at 1.1.1, if you find an "ascii art" flowchart, that
is not otherwise described in text, and is important to understanding the
content, you could argue that the content fails to provide a text
alternative of that "non text" content, on the basis that ASCII art isn't
actually readable text.

As it happens, this is of course F72, but there is no formal requirement
that you reference that in claiming that content failed to meet the
success criterion. Do of course note that exceptions are part of the
criterion, so if the ASCII art was purely decorative, your argument would
be considered weak by your peers...

And that's the crux of this. The spec is written with the goal that an
intelligent person testing some content can work out which ciretira are
applicable, and whether they are met. The further material is meant to
make that easier, in part through showing examples, and how a number of
independent experts apply the principle in each example case.

The WAI ACT work is trying to codify some examples more formally, but I
believe the assumption above that someone should be able to work it out
without examples still holds for the general case.

If you find a case that is not covered, but you think it is an example
likely to be repeated and so useful to others, I strongly encourage you to
describe it to the guidelines Working Group, and ask them to consider it
as a contribution to the techniques.

cheers

Chaals