What it does
The Accessibility Developer Guide covers accessibility-testing setup, underlying concepts and implementation examples. Its material includes keyboard use, screen readers, semantics, forms, tables and widgets.
Read the guide in sequence with Previous and Next, or use the sidebar to jump to a particular element. Setup covers testing environments, Knowledge explains the underlying behavior, and Examples supplies implementations to examine.
For a dialog, open Examples > Widgets > Dialogs and compare the native modal dialog, non-modal dialog and popover approaches. Expand Show HTML, Show CSS and Show JS to inspect each example, or follow its CodePen link. The comparison explains which patterns block interaction with the background and which keep it available. The modal example also walks through Escape-key dismissal and returning focus to the invoking control.
The guide is free, publicly accessible and published under the MIT licence. Its explanations assume some familiarity with HTML, CSS and JavaScript.
Strengths
- Working examples expose their markup, styles and scripts.
- The dialog comparison separates focus, background interaction and dismissal behavior.
Watch out for
- The technical explanations assume a working knowledge of HTML, CSS and JavaScript.
Best for
- Teams learning to implement and manually examine accessible interfaces
Sources
- Welcome to the Accessibility Developer Guide! (Oct 27, 2026)
- How to use this guide | ADG (Oct 27, 2026)
- Dialogs | ADG (Oct 27, 2026)
- License | ADG (Oct 27, 2026)