The text discusses "Accesibilidad" or "Accessibility" in the context of web design, emphasizing the importance of ensuring that websites are accessible to all individuals, regardless of disabilities or contextual factors. It mentions that accessibility is closely related to usability.

When websites are designed with accessibility in mind, users with various disabilities can access content equally. For instance, semantic XHTML code, alternative text for images, and meaningful link names benefit users who are blind and use screen readers or Braille displays. Subtitles in videos aid users with hearing difficulties, and simple language and illustrations benefit users with dyslexia or learning difficulties.

The text also notes that appropriate text size and the size of buttons or active areas can aid users with visual or motor impairments. Avoiding actions dependent on specific devices allows users to choose devices that suit them.

Limitations in website accessibility can be visual, motor, auditory, or cognitive. Visual limitations include various degrees of vision impairment and color blindness. Motor limitations involve difficulty or inability to use hands due to conditions like Parkinson's disease or muscular dystrophy. Auditory limitations include deafness or hearing deficiencies, while cognitive limitations encompass learning difficulties or cognitive disabilities affecting memory, attention, logical skills, etc.

The text mentions the World Wide Web Consortium (W3C) and its Web Accessibility Initiative (WAI) as key entities promoting web accessibility. The Web Content Accessibility Guidelines (WCAG) 2.0, published in December 2008, are internationally accepted standards. These guidelines address content accessibility, authoring tool accessibility, and user agent accessibility.

In summary, the text provides a comprehensive overview of the importance of web accessibility, the types of limitations users may face, and the guidelines set by organizations like the W3C to ensure that websites are inclusive and usable for everyone.