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The aim of the ONCE is that everyone, irrespective of having a disability, age or the technology they are using to access the website, can navigate through the pages of this website without finding any difficulty of access and enjoy the accessibility.

To this end, the development of the ONCE website has been based on the fulfillment of the Web Content Accessibility Guidelines 2.0 established by the W3C (World Wide Web Consortium).


Some of the functionalities implemented in the ONCE website to allow the accessibility to everyone all the contents of as easily as possible:

-       The font size has been defined with relative units so that it can be extended or reduced the font size from the browser options.

-       There is a link available to select high contrast color palette.

-       Pages are clearly structured both for the user, that can see all the content, and for screen reader users.

At the beginning there is a search engine followed by links to the main sections of the website. Then, indicated with the text “You are in”, there are some links that inform the user about the exact point where we are.

After these common elements, the specific content of the page is displayed. The different parts are marked like section headings. This way,  users of screen reader by speech synthesis will be able to navigate easily through the different parts by pressing the “H” letter.

The CSS and HTML code used meets the formal grammars to guarantee the correct visualization of the contents in different browsers.