Keyboard navigation
Moving through and operating a page with the keyboard alone, mostly with Tab, Enter, Space, and the arrow keys.
Keyboard navigation means every task on a page can be completed without a mouse. The Tab key moves between links and controls, Enter and Space activate them, arrow keys move inside menus and lists, and Escape closes things. People with motor disabilities, people who use switches or voice control, people who use a screen reader, and people who prefer keyboard shortcuts all depend on it.
It is the first thing to test because so much else builds on it. If a menu opens only on hover, a custom dropdown ignores the arrow keys, or focus disappears into a hidden element, a whole group of customers is stopped at that point. WCAG’s operable principle requires keyboard access to all functionality.
Source
Web Accessibility Perspectives Videos: Explore the Impact and Benefits for Everyone
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