How do you handle nested tabs and accordions in a way that is not confusing for users with disabilities?

1 Use clear labels and headings

One of the most important aspects of accessible tabs and accordions is to use clear and descriptive labels and headings for each section. Labels and headings should indicate the content and purpose of each section, and avoid ambiguity or duplication. They should also be visible and readable for all users, regardless of their screen size, zoom level, or color contrast preferences. Labels and headings should be marked up with appropriate HTML elements, such as <h1> to <h6> for headings, and <button> or <a> for labels, to convey their semantic meaning and role to assistive technologies.

2 Provide keyboard and focus support

Another essential feature of accessible tabs and accordions is to provide keyboard and focus support for users who navigate with the keyboard or other input devices. Users should be able to access, activate, and move between tabs and accordions using the tab, arrow, enter, and space keys, as well as the home and end keys for quick navigation. Users should also be able to see where their focus is on the page, by using visible focus indicators, such as outlines or highlights, for the active tab or accordion. Focus should also be managed properly, by moving the focus to the relevant content area when a tab or accordion is expanded, and by trapping the focus within a modal dialog if needed.

3 Add aria attributes and roles

Adding aria attributes and roles improves the accessibility and usability of the web elements. Aria attributes and roles are a set of standards that define how web elements are exposed to assistive technologies, such as screen readers or voice assistants. They can provide additional information, such as state, name, value, or description, that may not be obvious from the HTML markup alone. For example, you can use aria-selected, aria-expanded, aria-controls, and aria-labelledby to indicate which tab or accordion is selected, expanded, controlled, or labeled by another element. You can also use aria-hidden to hide irrelevant or redundant content from assistive technologies.

4 Avoid excessive nesting and complexity

A fourth and final recommendation is to avoid excessive nesting and complexity that may confuse or overwhelm users with disabilities. Nesting tabs and accordions inside each other can create multiple levels of hierarchy and interaction that may be difficult to perceive, understand, and navigate. It can also increase the cognitive load and memory demand for users who have to remember the state and location of each section. Therefore, you should limit the number of nested tabs and accordions to a minimum, and consider alternative ways to present your content, such as using headings, lists, tables, or graphs.