What would it mean for the user when designing perceivable content?

Designing perceivable content means that the content should be presented in a way that can be convertible between different formats, so that users with different sensory abilities can access it. For example, providing text alternatives for images and videos, captions and transcripts for audio, and audio descriptions for visual content. This way, users who are blind, deaf, or have low vision or hearing can perceive the content using assistive technologies, such as screen readers, braille keyboards, or captions. The content should not only be presented in a visual format (A) or an audio format (B), as that would exclude users who cannot see or hear the content. The content should be adaptable to different formats and devices, and follow the Web Content Accessibility Guidelines (WCAG) principle of perceivability12. References:

Perceivable - Accessibility | MDN

What Is Perceivability in Web Accessibility? WCAG Principles Explained