If a static web-page is checked for accessibility and passes then all is well. However checking the accessibility of the output from a dynamic (scripted) web-page is like testing a program to find errors. However many times a test succeeds it is always possible that the program will produce bad output next time. What is needed is something closer to a proof of correctness. This paper describes a first attempt to provide a proof of validity for dynamic web-pages which can be extended to a proof of accessibility.
This paper discusses extensions to the previously developed "essentiality and proficiency" approach to increasing usability and accessibility of websites. The existing approach is introduced, as is a new application in the processing of Doc-Book XML documents. The current principles are extended to make them more appropriate for increasing the usability of long documents. Techniques for allowing organisations to efficiently disseminate information based on the proposed application are discussed-increasing productivity for both non-disabled and disabled users.
Although standards and legislation such as Web Content Accessibility Guidelines 1.0 and the Disability Discrimination Act 1995 have come into place, the inaccessibility of web content still exists. This paper presents the Essentiality and Proficiency Tool. The tool is a proxy service that will enable the user to view web content in accordance with their individual needs. A prototype has been developed and tested, highlighting insights into user patterns. The paper will explore the importance of universal design in making the Internet more accessible. It will further explore how user profiles endorse universal design, leading to a more usable experience. Although the emphasis is on a universal tool we start by concentrating on users with visual impairments as this is identified as the largest disability group.
Engineering, Amsterdam, 2006, pp. 215-217 Additional Information:• This is a refereed conference paper. Amsterdam, 2006, pp. 215-217, ISBN: 1-59593-515-0 ABSTRACTThis work originated by considering the needs of visually impaired users but may have wider application. A profile captures some key descriptors or preferences of a user and their browsing device. Individual users may maintain any number of profiles which they can edit for use in different situations, for different tasks or with different devices. A profile is described in terms of essentiality and proficiency. Essentiality is used to control the quantity of information that is transmitted and proficiency is used to control the format. Various levels of essentiality are introduced into a document by the technique known as microformatting. Proficiency (for the visually impaired) includes a description of minimum acceptable font size, preferred font face and preferred text and background colours. A key feature of the proficiency profile is the accessibility component which captures the user's tolerance of accessibility issues in a document, for example the presence of images or the markup of tables. The document delivery tool works as a kind of filter to reduce the content to the level of essentiality requested, to make the various presentation changes and to warn of accessibility issues as specified in the user's profile. Encouraging preliminary results have been obtained from testing the prototype with subjects from the local RNIB college.
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