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Re: 1.4.3 & 2.4.7: evaluation while blind

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From: Detlev Fischer
Date: Sep 18, 2019 6:31AM

In our experience, there are many aspects of 1.3.1 that CAN be tested by
blind evaluators - consistency of headings hierarchy, are nav menus
organised as lists, are labels programmatically linked to inputs, are
fieldset/legend or aria group constructs used on non-expressive radio or
checkbox inputs, are data tables correctly marked up, etc. In other
words, there will often be aspects of content where blind testers can
demonstrate failures. It is true that the aspect of 1.3.1 where visual
appearance is checked against semantic markup is not doable, or only to
some extent. For example, in browse mode, the tester may come across
bits of text that could potentially be headings but are not marked up as
such (and then the tester will not know whether they visually stand out
as headings).So I agree that a blind tester alone cannot safely
demonstrate conformance to 1.3.1 but often, he/she can demonstrate
non-conformance.
Detlev

Am 18.09.2019 um 14:12 schrieb Patrick H. Lauke:
> On 18/09/2019 12:30, Steve Green wrote:
>> I don't see how a blind person can test several others, such as 1.3.1
>> Info and Relationships. That SC requires you to assess the visual
>> presentation and check if the information and relationships are
>> conveyed programmatically. How can you do that if you can't see it?
>>
>> There are others like 1.3.2 Meaningful Sequence. If you can only
>> perceive the programmatic reading sequence and not the visual
>> sequence, how can you tell if it is correct?
>>
>> And 1.4.1 Use of Colour. How can you tell if colour alone is being
>> used? It might be possible by analysing the styles, but that won't
>> work if the colour is in images.
>>
>> I won't labour the point, but if you can't perceive something, how
>> can you know if there is anything to perceive?
>
> Oh, absolutely. Sorry, wasn't trying to make an exhaustive list :)
>
> P

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Detlev Fischer
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