How to configure the accessibility of drop-down menus and navigation bars for keyboard control?

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Drop-down menus and complex navigation bars are standard elements of modern websites, but they often cause serious problems for users who do not use a computer mouse. Controlling such components exclusively via keyboard requires well-thought-out focus movement logic and special key press handling.

To ensure that a user can successfully open a submenu, select the desired item, and return back without losing context, developers must implement standard accessibility pattern behaviors. This includes not only visual indication of the active element, but also programming reactions to arrow keys, the Enter key, and Escape.

To make a drop-down menu fully accessible for keyboard navigation, follow these steps:

1. Ensure the main menu item is accessible for receiving focus using the Tab key.
2. Add the aria-expanded attribute with a value of false by default and change it to true when the drop-down list opens.
3. Program the handling of Down Arrow and Up Arrow key presses for cyclic movement between items in an open submenu.
4. Configure the active submenu to close and return focus to the parent element when the Escape key is pressed.
5. Visually highlight the focused interface element using a contrast border or a background color change via focus styles.

Implementing these requirements makes the interface equally convenient for sighted users and people with motor impairments. Predictable control element behavior significantly improves the overall ergonomics of the site and complies with modern web standards.

How to configure the accessibility of drop-down menus and navigation bars for keyboard control?

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