Accessibility Principles & Best Practices
Overview
Understanding Accessibility
Accessibility is not about disability; it’s actually about ability. It’s about making it easy for everyone.- Acquire the same information
- Engage in the same interactions
- Enjoy the same services
In an equally effective and equally integrated manner, with substantially equivalent ease of use.
Principles for Information and Communication Technology (ICT)
- Perceivable: so that individuals with visual impairments can understand the information being conveyed
- Operable: navigate to information in multiple methods (not only the mouse)
- Understandable: understandable enough so that all different learning styles can engage
- Robust: IT products should be compatible with a user’s desired technologies or system preferences
Universal Design Principles
concentration level. Science lab equipment with clear and intuitive control buttons is an example of an application of this principle.
user's sensory abilities. An example of this principle is captioned television programming projected in a noisy sports bar.
product applying this principle is software applications that provide guidance when the user makes an inappropriate selection.
Best Practices for Accessibility
- Organize content with headings, subheadings, images, videos, and footer are important for usability and accessibility.
- Use Heading Styles in a logical sequence to give a structure by category or topic.
- A written description of images and/or objects that can be read by a blind or low vision using screen reader technology.
- Screen readers and other assuasive technologies can’t convert images into words/texts. Thus providing captions are universal and accessible for everyone.
- Recommend brief descriptive text within 8 to 80 characters long.
- Provide descriptions if using color to convey meaning
- Download onto your computer (PC/Mac) to ensure accessible contrast or use an online contrast checker from .
- WCAG Level AA requires a contrast ratio of at least 4.5:1 for normal sized text (12 pt. font) and 3:1 for large text (14 pt. font).
Users should be able to get to content without using a mouse
• Keyboard
• Hearing
• Touch
Users should be able to access content on different screens (phone, tablet, etc.)
• "Read more", "click here", "email me", or "continue" are vague and redundant.
Link text should clearly identify the target of each link. Good link text should not be overly general.
• Make sense when read out of context.
• Describe the destination (document name, website).
• Be unique for unique destinations.
Do not use color links as the only method to convey important information.
• Tab order should read from the upper left to the lower right, and make sense to both sighted and visually impaired users.
How to Evaluate Accessibility Based on Four Principles
- Font: Is the font styling easy to read?
- Color: Is the font color easy to read?
- Tab: Can a user "tab" through the functions?
- Enlarge: Can a user make the font bigger? (ctrl +)