Final answer:
The principle from the WCAG that ensures content is accessible across various technologies is the 'Operable' principle. It emphasizes the need for content to be compatible with assistive technologies like screen readers and adaptable to users with different abilities.
Step-by-step explanation:
According to the Web Content Accessibility Guidelines (WCAG), the principle that requires content to be available to technologies individuals are using, such as screen readers or an older version of a browser, is Operable. This principle ensures that users can operate the interface and that it does not require interaction that a user cannot perform. Therefore, when considering accessibility for individuals who may have hearing or vision disabilities, it is critical to provide alternative text, use high-contrast color schemes, and ensure content is accessible through assistive technologies. Technologies like screen readers, text-to-speech software, and closed captions can help make multimedia content, like videos, maps, and animations, accessible to all users.
Universal design and accessibility are essential for creating multimodal compositions that are inclusive. By considering accessibility early in the design process, creators can ensure that their content is usable by everyone, regardless of their abilities or the technologies they use.