Barriers to use: usability and content accessibility on the Web's most popular sites
CUU '00 Proceedings on the 2000 conference on Universal Usability
Quantitative metrics for measuring web accessibility
W4A '07 Proceedings of the 2007 international cross-disciplinary conference on Web accessibility (W4A)
Hera-FFX: a Firefox add-on for semi-automatic web accessibility evaluation
Proceedings of the 2009 International Cross-Disciplinary Conference on Web Accessibililty (W4A)
Web not for all: a large scale study of web accessibility
Proceedings of the 2010 International Cross Disciplinary Conference on Web Accessibility (W4A)
Macroscopic characterisations of Web accessibility
The New Review of Hypermedia and Multimedia - Web Accessibility
Method to improve accessibility of rich internet applications
USAB'11 Proceedings of the 7th conference on Workgroup Human-Computer Interaction and Usability Engineering of the Austrian Computer Society: information Quality in e-Health
Evaluating the accessibility of rich internet applications
Proceedings of the International Cross-Disciplinary Conference on Web Accessibility
A macroscopic web accessibility evaluation at different processing phases
Proceedings of the International Cross-Disciplinary Conference on Web Accessibility
Accessibility of dynamic adaptive web TV applications
ICCHP'12 Proceedings of the 13th international conference on Computers Helping People with Special Needs - Volume Part I
Assessing the effort of repairing the accessibility of web sites
ICCHP'12 Proceedings of the 13th international conference on Computers Helping People with Special Needs - Volume Part I
Accessibility in rich internet applications: people and research
Proceedings of the 11th Brazilian Symposium on Human Factors in Computing Systems
Proceedings of the 11th Brazilian Symposium on Human Factors in Computing Systems
Hi-index | 0.00 |
Modern Web sites leverage several techniques (e.g. DOM manipulation) that allow for the injection of new content into their Web pages (e.g., AJAX), as well as manipulation of the HTML DOM tree. This has the consequence that the Web pages that are presented to users (i.e., browser environment) are different from the original structure and content that is transmitted through HTTP communication (i.e., command line environment). This poses a series of challenges for Web accessibility evaluation, especially on automated evaluation software. This paper details an experimental study designed to understand the differences posed by accessibility evaluation in the Web browser. For that, we implemented a Javascript-based evaluator, QualWeb, that can perform WCAG 2.0 based accessibility evaluations in both browser and command line environments. Our study shows that, in fact, there are deep differences between the HTML DOM tree in both environments, which has the consequence of having distinct evaluation results. Furthermore, we discovered that, for the WCAG 2.0 success criteria evaluation procedures we implemented, 67% of them yield false negative answers on their applicability within the command line environment, whereas more than 13% of them are false positives. We discuss the impact of these results in the light of the potential problems that these differences can pose to designers and developers that use accessibility evaluators that function on command line environments.