Which principle in web accessibility ensures content is available through multiple sensory modalities?

The principle that ensures content is available through multiple sensory modalities is Perceivable. This principle emphasizes that information presented on a website must be accessible through different senses. For instance, it means that text can not only be read visually but also through screen readers for visually impaired users. Additionally, audio content should be accompanied by text transcripts for those who are deaf or hard of hearing, thereby allowing users to perceive the information in a manner that suits their needs.

The Perceivable principle supports various formats and adaptations, ensuring that users can access the same information in ways that align with their preferences or abilities. This inclusivity is foundational in creating a web experience that accommodates diverse user needs.

Other principles, while important in their own right, focus on different aspects of accessibility. The Operable principle centers on ensuring that users can navigate and interact with web content effectively. The Robust principle relates to the reliability of the content across different platforms and tools, while the Understandable principle addresses the clarity and simplicity of the information being communicated. Each of these plays a critical role in overall web accessibility but does not directly address the idea of multiple sensory modalities like Perceivable does.