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Accessibility

This website has been designed respecting level AA of the Web Content Accessibility Guidelines (WCAG) 2.0 of W3C to enable it to be accessed by as many people as possible.

These Guidelines are organised as follows:

The Web Content Accessibility Guidelines (WCAG) 2.0 cover a wide range of recommendations to create more accessible web content. Following these guidelines allows the creation of content that is more accessible to a greater number of people with disabilities, including blindness and vision impairments, deafness and hearing impairments, learning difficulties, cognitive disabilities, reduced mobility, speech disabilities, photosensitivity and combinations of the above. Following these guidelines can often help to make web content more usable for a wide diversity of users.

Levels of guidance

WCAG 2.0 provides various levels of guidance: general principles, general guidelines, verifiable conformity criteria and an extensive collection of sufficient techniques, recommended techniques and common failures documented with examples, links to additional resources and code.

  • Principles – The highest level contains the four principles, which lay the foundation necessary for anyone to access and use web content: perceivable, operable, understandable and robust.
  • Guidelines – Under each principle there is a list of guidelines. The twelve guidelines provide the basic objectives that authors must meet in order to create more accessible content for users with different disabilities. These guidelines are not verifiable, but they provide the framework and the general objectives that help authors to understand the conformity criteria and to implement the techniques more successfully.
  • Conformity criteria – Under each guideline there are verifiable conformity criteria that enable the use of WCAG 2.0 in situations in which there is a requirement or a need for conformity assessment such as: design specifications, purchasing, regulation or contractual agreements. In order to comply with the needs of different groups and situations, three levels of conformity are defined: A (the lowest), AA and AAA (the highest).
  • Sufficient and recommended techniques – For each of the guidelines and conformity criteria of the WCAG 2.0 document, the working group has also documented a wide variety of techniques. The techniques are informative and are grouped in two categories: those that are sufficient to meet the conformity criteria, and those that are recommended. The recommended techniques go beyond the requirements of each individual conformity criterion and allow authors to apply the guidelines better.

How are we improving accessibility?

These are some of the characteristics of the website that help to improve accessibility:

  • All non-text content has a text alternative.
  • Colour is not used as the only visual means of conveying information, indicating an action, prompting a response or distinguishing a visual element.
  • The visual presentation of text and images of text has a contrast ratio of at least 4.5:1.
  • Text size can be established in relative sizes. This allows the person viewing the pages to resize the text, if required, using the browser tools.
  • The possibility of bypassing blocks of links is offered to allow the main page content to be accessed directly. This is important in non-visual
  • Browsing via the keyboard is possible.
  • The order of the contents in the code is the same as the order of the contents in the visual presentation.
  • The web pages have titles that describe their topic or purpose.
  • When the text of the link is not explanatory, a description of it is added, visible via many browsers when the mouse hovers over the link.
  • More than one way is available to locate a web page within a set of web pages.
  • Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
  • The page code indicates the language of the document. This improves accessibility in non-visual browsers.
  • The forms have labels that identify the function of each component. When it is not possible to include the label, the component contains an alternative text that identifies the function.
  • In this website intensive use is made of style sheets (css), in order to separate content from presentation.