WCAG

The Web Content Accessibility Guidelines describe how to make digital content usable for people with a disability. They are organised around four principles: perceivable, operable, understandable and robust. Level AA is the common benchmark and the level European regulation refers to.

Accessible material is not only relevant for colleagues with a disability. Subtitles help everybody in a noisy working environment, sufficient contrast helps in sunlight on a tablet, and keyboard operability helps anyone wearing work gloves.

Hearing damage runs wider in industry than people assume: years of working at high noise levels leave their mark. A training video without subtitles shuts out part of the audience who will not raise it themselves. Colour is a second point, because a process deviation you flag only in red and green is unreadable for roughly one man in twelve.