July 2026
Intermediate to advanced
396 pages
11h 2m
English
Content preview from Full Stack Testing, 2nd Edition
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Chapter 9. Accessibility Testing
Accessibility—essential for some, useful for all.
World Wide Web Consortium (W3C) Web Accessibility Initiative (WAI)
The web is an essential aspect of our lives in so many ways. Web accessibility is the practice of making it available to all users, including those with permanent, temporary, or situational disabilities such as visual impairments, advanced age, and literacy gaps. Accessibility is a subset of usability, in web development terms, and a subset of inclusivity, in humanitarian terms. Accessibility is sometimes abbreviated to a11y, and you’ll see that used often.
The Web Accessibility Initiative’s tagline, “Essential for some, useful for all,” emphasizes that web accessibility features are useful for all users, irrespective of disabilities or other obstacles. For example, all of us prefer a clear, structured, easily navigable layout where the different parts of the page are easy to locate and identify. Similarly, voice-enabled applications and understandable error messages and instructions help all users.
There is a concrete business case to invest in web accessibility features: roughly 20% of the world’s population has some sort of disability, a group whose purchasing power is equivalent to the world’s third-largest economy.
In many places, web accessibility is also a legal requirement. The United Nations Convention on the Rights of Persons with Disabilities (UN CRPD), on which many countries base their legal policies, holds that access ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.