Accessibility Level

During the development of these pages, we have attempted to achieve an AA accessibility level according to the web content accessibility guidelines included in the UNE 139803:2012 Standard (Accessibility requirements for content on the web). Where possible, appropriate measures have also been applied to meet some of the level 3 priorities. However, in our efforts to improve this site, we ask that if you have any suggestions with which we can improve the accessibility level of this page, please communicate it to the address

Compliance with Standards

All pages on this site are valid according to the HTML 5 DTD. Unlike accessibility, whose level requires expert judgment, validity can be checked using a validator. These pages have passed the code validator tests of the W3C.

Navigation Aids

To facilitate access to content for users who use a screen reader, an initial link has been enabled that directly directs to the main content of each document. Each document is structured so that the main sections are first-level headers, to facilitate navigation through them. The text of the links has been written so that they are meaningful out of context. However, for cases where they may be ambiguous or confusing, assistance has been enabled through the attribute. To establish useful relationships between documents for "text-only" browsers, link elements with the attributes rel="home" (to the main page of the site), rel="help" (to the accessibility document), and rel="acontents" (to the site map) have been included on each of their pages.
The main language of each page has been identified, as well as any changes in the natural language of the text, which facilitates its treatment and understanding for users of screen readers and voice synthesizers. JavaScript behaviors have been implemented in a non-obtrusive manner. Therefore, although they may improve the user experience, access to content is never compromised if your browser does not have JavaScript enabled.


The visual appearance of this site is defined through CSS, so it can be disabled at any time if your browser has the appropriate contextual menu. The style sheet is valid and standard, as can be verified by the W3C CSS validator. The font size has been defined in relative units to allow it to be scaled through the corresponding menu in the user's browser. All images have their corresponding alternate text (alt). In necessary cases, a help text has been included through the "title" attribute.