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* '''Cognitive/Intellectual:''' [[Developmental disabilities]], [[learning disabilities]] ([[dyslexia]], [[dyscalculia]], etc.), and [[cognitive disabilities]] of various origins, affecting memory, attention, developmental "maturity," problem-solving and logic skills, etc.;
== Benefits of Web accessibility ==
Designing websites with accessibility in mind can often enhance usability for all users. Good design can also deliver easier access for automated software programs that read website content, such as search engines.
One important aspect of accessibility is to let people access content in their preferred way. This can also benefit all users not just those with disabilities: for example, some users may wish to adjust text sizes because they are using a very small display on a mobile phone, or may need to use keystrokes to control their computer because they do not have a mouse or prefer not to use one. Search engines generally cannot make much use of graphics.
Different sites will require different degrees of concern for accessibility. For example,
* a site providing information specific to Attention-Deficit/Hyperactivity Disorder ([[ADHD]]) needs to be easily accessible by people with ADHD (although you must keep in mind that other users may also wish to access the same information)
* a government site of general interest or a resource directory for people in crisis would need to take into account as many disabilities as possible in order to be available to all citizens.
Many people with partial visual impairments or [[dyslexia]] will want to change the colours of text or the background to make it easier to read. Users with dyslexia or [[ADHD]] will want to stop moving images on the screen because they are easily distracted. People with ADHD may also be confused or distracted by link-rich sites because they can have difficulty when presented with so many options.
For example, [[hyperlink]]s that can only be followed by clicking on them with a [[Mouse (computing)|mouse]] are impossible to use for those who can only use a [[Computer keyboard|keyboard]] or screen reader to interact with their [[Personal computer|computer]]. Information provided only in [[Sound|audio]] format cannot be accessed by people who are deaf, and if provided only in [[Graphics|graphic]] format information is invisible to people who are blind.
Designing sites in accordance with Web accessibility principles is necessary to enable access for all users.
A set of guidelines [http://www.learningdisabilities.org.uk/page.cfm?pagecode=ISSIWD] and two accessible[http://www.learningdisabilities.org.uk/page.cfm?pagecode=ISSIWDAS] web portals designed for people developing reading skills are peepo.com [http://www.peepo.com] — try typing a letter with your keyboard for more — and peepo.co.uk [http://www.peepo.co.uk] with enhanced graphics, unique style controls and improved interactivity (requires SVG supported browser).
== Technology ==
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