A problem with some Web Accessibility Evaluation Tools

Dear all,

Some of the tools included in the WAI Web Accessibility Evaluation Tools List (http://www.w3.org/WAI/ER/tools/), do not detect accessibility problems when a part of a web page is generated dynamically with JavaScript, as in this very basic example:

<html lang="en">
  <head>
    <title>Page with image without text alternative</title>
  </head>
  <body>
    <script language=javascript>
       document.write("<img src=logo.jpg>");
    </script>
  </body>
</html>

If you test the above source code included in this web page: http://www.cc.uah.es/hilera/a11y/example.html

You can see  that, at least, these online WCAG evaluation tools do not detect the non-compliance of Success Criterion 1.1.1 (Use alt on img elements):


-        AChecker

-        Examinator

-        WAVE

On the contrary, this WCAG evaluation tools can detect the problem:


-        FAE

-        Tenon

-        Tingtun

Probably, the problem arise because the first tools evaluate only the HTML source code, and the latter tools wait for JavaScript to render (JavaScript modifies the DOM), and then evaluate the HTML of the rendered page.

So could be interesting to include an new filtering option in the WAI Web Accessibility Evaluation Tools List, as "Evaluation of DOM instead HTML source".


Regards


-------------------------------------------------------
José R. Hilera
University of Alcalá - Spain
http://twitter.com/accesibilidad_w

Received on Tuesday, 22 September 2015 16:47:03 UTC