How to perform manual keyboard testing for accessibility?

Manual keyboard testing for accessibility involves testing the functionality and usability of a website or application using only a keyboard, without relying on a mouse or other pointing devices. 

Here are the steps to perform manual keyboard testing for accessibility:

1. Understand keyboard accessibility requirements: Familiarize yourself with the Web Content Accessibility Guidelines (WCAG) and the specific keyboard accessibility standards and best practices.
2. Navigate using keyboard only: Use the Tab key to navigate through the interactive elements on the website or application. Ensure that you can access all interactive elements, such as links, buttons, form fields, and menus, using only the keyboard. Verify that the focus indicator is visible and provides clear visual feedback.
3. Test keyboard shortcuts: Check if any keyboard shortcuts are provided and ensure they are functional. Test common shortcuts such as Ctrl+F (Find), Ctrl+Z (Undo), or Ctrl+C (Copy) to verify their behavior.
4. Verify keyboard traps: Ensure there are no keyboard traps that prevent users from navigating away from certain elements or sections. Users should be able to move away from any focusable element using the Tab key or Shift+Tab to reverse the tab order.
5. Test form interactions: Fill out forms using only the keyboard and verify that you can navigate between form fields using the Tab key. Check that error messages and validation are presented clearly and keyboard accessible.
6. Test dynamic content: If the website or application includes dynamic content or menus, ensure that the keyboard focus moves to newly revealed content and that users can interact with it using the keyboard.
7. Test keyboard compatibility with assistive technologies: Use screen readers or other assistive technologies along with the keyboard to ensure compatibility and proper functionality.