Una excelente crítica de las capas de accesibilidad (accessibility overlay)

Karl Groves, un experto internacional en accesibilidad web, ha escrito What would an ethical overlay look like?:

Accessibility overlays have existed on the market since at least around 2004. Companies such as Readspeaker offered products that displayed a widget on customers’ websites that were best described as “add-on assistive technologies”. The primary feature offered by such products was the ability to read the page content aloud to a website’s users.
The benefit to such a feature would seem obvious to the layperson: If you have problems seeing the page or have problems reading, then a feature that reads the content for you would certainly be a significant improvement.  To people with deep knowledge of the Web and accessibility, the shortcomings of a per-site read-aloud widget are glaring. After all: if a user needs to have the content read-aloud to them on one site, they’ll need it on all websites and all applications they use.  In other words, such software is best deployed on the user’s computer, not on individual websites.
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It is simply impossible to examine the claims made by overlay vendors against what their products actually do and come up with a conclusion that differs from the following: 
Overlay vendors overstate their products’ capabilities. They deceive their customers and, as a result, are actively harming the field of accessibility and doing a severe disservice to end users with disabilities. This, in turn, is a waste of money and delays active improvement to a website. These products will not make your site compliant with the ADA, Section 508, EN 301 549, or any other regulation based on WCAG.

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