What is the purpose of user agents in web accessibility?

User agents play a critical role in web accessibility as they are responsible for retrieving and displaying web content to users. Essentially, they act as intermediaries between the user and the web, processing HTML, CSS, and other web technologies to render content in a format that is accessible and usable for individuals, including those with disabilities.

By providing the means for users to interact with web content, user agents facilitate various accessibility features such as text-to-speech for visually impaired users, enhanced navigation options for users with motor disabilities, and customizable display settings to cater to individual needs. Therefore, their function is crucial in ensuring that all users can access and engage with web content effectively.

The other options focus on activities that are not aligned with the primary role of user agents in web accessibility. While creating website content is important for accessibility, it is not the purview of user agents. Similarly, tracking and analyzing user data does not contribute directly to the display of content for users. Lastly, restricting access to functionalities would be counterproductive to the principles of accessibility, which aim to facilitate, not limit, user interaction with web resources.