Which principle of web accessibility supports compatibility with assistive technologies?

The principle of web accessibility that supports compatibility with assistive technologies is Robust. This principle emphasizes that content must be created in a way that can be interpreted reliably by a wide range of user agents, including assistive technologies such as screen readers, speech recognition software, and other adaptive tools. By ensuring web content is robust, developers can accommodate technological advancements and changes in assistive technologies, allowing all users to access information regardless of their device or method of interaction.

Content that meets the robustness criterion is built using valid coding standards and practices, successfully supporting future user interface techniques and interactions. This ensures that as new technologies emerge, including enhanced versions of assistive tools, users will still be able to access and navigate web content effectively.

The other principles, while essential for overall accessibility, address different aspects. For instance, Perceivable focuses on ensuring content is presented in ways that users can perceive, Operable emphasizes the need for users to interact with the interface, and Understandable ensures that information and operation of the user interface are clear and intelligible. These principles, while critical for inclusivity, do not specifically encompass the interaction with or compatibility of assistive technologies as the Robust principle does.