Perceivable / 1.1 Text Alternatives

Non-text content such as images, icons, and diagrams needs a text alternative that serves the same purpose. It lets text-based assistive technologies, like screen readers and braille displays, convey the same information, while purely decorative elements should instead be hidden from assistive technology. For cases like CAPTCHAs or tests where a full alternative would defeat the purpose, a short identifying description is enough.