Acc - an Accessibility Evaluator

• Downloads
• Further development
• Usage
• Features
• Known Problems
  • Bugs
• Source Code
• License
• Master Thesis

Acc - an Accessibility Evaluator is a developing Firefox Extension, which is capable of evaluating and reporting some accessibility criteria. This proof-of-concept demonstration reveals vast possibilities of web browser -based website accessibility evaluation.

Downloads

Acc - an Accessibility Evaluator prototype version 1.0.2:

http://appro.mit.jyu.fi/tools/acc/acc.xpi

Further development

Extension development is continued by Foxability-project. Foxability is going to be modular and extensible accessibility analyzing extension.

Usage

Open the file with Firefox and give priviledges to install the extension. Restart Firefox and you should see Evaluate Accessibility option in Tools menu.

Features

Acc - an Accessibility Evaluator tries to do what other evaluators can't do. It includes basic explicit test for HTML, but also includes features like

• Visual layout extraction implementation
• Basic scalability test
• Deeply nested layout tables test
• Skip to Main Content link check
• Navigation consistency check compared to previous page
• Scripted page evaluation

Known Problems

If you have a slow processor like Pentium III at 1GHz, layout extraction process on large web site may take more than five seconds which is default maximum time for script runtime. Solution: point your browser to about:config, search for property dom.max_script_run_time, double-click it and set maximum running time to 20 secs or more.

Bugs

• Bugs
• Missing features

Source Code

The source code is inside xpi-package. UnZip the acc.xpi. UnZip acc.jar in chrome directory. .js and .xul files in content directory are probably what you are looking for.

License

Acc - an Accessibility Evaluator is licensed under GPL.

For other licensing purposes, please contact author (jmantyla@mit.jyu.fi).

Master Thesis

The extension development work is part of my Master Thesis (in Finnish):

• HTML: WWW-sivun saavutettavuuden automaattinen arviointi DOM-rajapintaa käyttäen / Jukka Mäntylä
• PDF: WWW-sivun saavutettavuuden automaattinen arviointi DOM-rajapintaa käyttäen / Jukka Mäntylä