Developing Accessible Websites
In order to assure that websites and web applications are accessible to and usable by everyone, designers and developers must follow web accessibility guidelines. Each of the following topics addresses issues that are especially common on CU Denver and
CU Anschutz websites. See also our annotated list of web accessibility Resources.
Features of Accessible Websites
Additional information is available on the AccessComputing website 30 Web Accessibility Tips.
Checking a Website for Accessibility
You can go a long way toward assuring your website is accessible by following these simple steps:
- Validate your HTML. If HTML is used incorrectly, assistive technology can have problems interpreting the page content, which can result in access problems for users. Use an HTML validator to
check your code.
- Test with a keyboard. Set your mouse aside and use the tab key to navigate through your web pages. You should be able to access all interactive features (e.g., menus, links, form fields, buttons, controls) and operate them by pressing Enter,
space, arrow keys or other intuitive keystrokes. If you are unable to access some of your site’s features, your site is likely to have accessibility problems.
- Use an accessibility checker. There are several free online tools that will check your web pages for accessibility. See our Tools and Resources page
for an annotated list.
- Test with users. You can test your site by simply recruiting and observing users as they interact with your site. To test for accessibility, recruit users who have a variety of skill levels and characteristics.
- Ask for help. The CU community is actively working toward the goal of full accessibility for all visitors to its websites. Since we’re all working together toward this goal, there are many in the community who are happy to help. See
Getting Help with Accessibility for more information.
What is Web Accessibility?
People who use the web have a growing variety of characteristics. As web developers, we can not assume that all our users are accessing our content using the same web browser or operating system as we are, nor can we assume they’re using a traditional
monitor for output, or keyboard and mouse for input. Consider these user characteristics:
- Unable to see. Individuals who are blind use either audible output (products called screen readers that read web content using synthesized speech) or tactile output (a refreshable
- Has dyslexia. Individuals with learning disabilities such as dyslexia may also use audible output, along with software that highlights words or phrases as they’re read aloud using synthesized speech.
- Has low vision. Individuals with low vision may use screen magnification software that allows them to zoom into all or a portion of the visual screen. Many others with less-than-perfect eyesight may enlarge the font on websites using standard
browser functions, such as Ctrl + in Windows browsers or Command + in Mac browsers.
- Has a physical disability. Individuals with physical disabilities that affect their use of hands may be unable to use a mouse, and instead may rely exclusively on a keyboard or use assistive technologies such as speech recognition, head pointers,
mouth sticks, or eye-gaze tracking systems.
- Unable to hear. Individuals who are deaf or hard of hearing are unable to access audio content, so video needs to be captioned and audio needs to be transcribed.
- Using a mobile device. Individuals who are accessing the web using a compact mobile device such as a phone face accessibility barriers, just like individuals with disabilities do. They’re using a small screen and may need to zoom in or
increase the font size, and they are likely to be using a touch interface rather than a mouse. Also, Apple’s iPhone and iPad do not support Adobe Flash.
- Limited bandwidth. Individuals may be on slow Internet connections if they’re located in a rural area or lack the financial resources to access high-speed Internet. These users benefit from pages that load quickly (use graphics sparingly)
and transcripts for video.
- Limited time. Very busy individuals may have too little time to watch an entire video or audio recording, but can quickly access its content if a transcript is available.
An accessible website works for all of these users, and countless others not mentioned.