Functionality on a web page that is both mouse and keyboard accessible demonstrates which web accessibility principle?

The principle of operable accessibility emphasizes that users must be able to interact with a website's functionality using various input methods, including both mouse and keyboard controls. When a web page ensures that all its interactive elements—such as buttons, forms, and links—can be accessed and utilized through keyboard navigation, it confirms adherence to this principle. This is especially important for individuals who may not be able to use a mouse due to physical limitations.

To illustrate, if a user can navigate through a website using only the keyboard (e.g., by using the Tab key to move between links and buttons), it indicates that the site is designed in a way that supports user interaction regardless of their preferred method. This inclusiveness is central to the operable principle of web accessibility, ensuring that functionality is not restricted solely to mouse users.

In contrast, the other principles focus on different aspects of accessibility: the understandable principle centers on the clarity and comprehensibility of the content, the perceivable principle relates to the presentation of information in a way that can be perceived by all users (such as providing alternative text for images), and the robust principle emphasizes compatibility with a wide range of user agents, including assistive technologies. Each principle plays a crucial role in creating an accessible web