Make all functionality available from a keyboard
When a functionality can be achieved using only the keyboard, other input devices can be used. But, if you use only a mouse or a speech input, assistive technologies will find it difficult to operate it.
Obviously, you can use another input devices to complement the keyboard, and even you are encouraged to do it, but don’t forget that every feature must be operable by a keyboard input.
Provide users enough time to read and use content.
Imagine you are reading a webpage and, in the middle of that proccess, the page reloads and changes, so you can not finish the reading of the formerly page. Everybody needs different time to complete tasks, and this time is usually higher on the elderly and users with disabilities.
So this guideline is about eliminating time constraints or providing users enough additional time to allow them to complete their tasks.
Do not design content in a way that is known to cause seizures.
Three-flash-in-a-second is the lower rate recommended to show flash content for people who suffer from seizures due to photosensitivity, specially for red lights. But still there are more sensitive people that react to lower rates, so the recommendation is to eliminate this type of visual content.
What is the difference between “blinking” and “fashing”?
- content that distracts, and can be used for a short time as long as it stops or can be stopped by the user. If blinking occurs faster than 3 per second, it should be considered a flash.
- content faster than 3 per second, and large and bright enough to cause a seizure The chance to turn the flash off is not an option since the seizure could occur faster than most users could turn it off.
How do you know if your content is flashing or blinking? Try the Photosensitive Epilepsy Analysis Tool.
In order to not interfere with other content of the webpage, these criteria applies for the whole page.
Provide ways to help users navigate, find content, and determine where they are
Finding the content and keeping track of our location are usually difficult tasks for people with disabilities, especially for those who use screen reader or cognitive disabilities. So these criteria are made for them.
- Limit the number of links per page
- Provide mechanisms to navigate to different sections of the content of a Web page
- Make links visually distinct