1. Overview

A person with low vision may turn on dark theme, outline text and a larger font. A person with a vestibular disorder may turn on Remove animations. A deaf person may set captions to large yellow text on black. Each choice only works if your app respects it.

WCAG 2.2 sets the floor for colour: 1.4.1 Use of colour, 1.4.3 Contrast (minimum) and 1.4.11 Non-text contrast. For motion it sets 2.2.2 Pause, stop, hide and 2.3.1 Three flashes or below threshold. For video it sets 1.2.2 Captions (prerecorded). EN 301 549 carries these into clause 11. It then adds two duties of its own:

  • Clause 11.7 says the app must follow the person's accessibility settings.
  • Clauses 7.1.1 and 7.1.4 say a video player must show subtitles and let the person adjust how they look.
Standards covered: WCAG 2.2 success criteria 1.2.2, 1.2.4, 1.4.1, 1.4.3, 1.4.11, 2.2.2 and 2.3.1 · EN 301 549 V4.1.1 clauses 7.1.1, 7.1.4, 11.1.2.2, 11.1.2.4, 11.1.4.1, 11.1.4.3, 11.1.4.11, 11.2.2.2, 11.2.3.1, 11.6.2 and 11.7. In V4.1.1 the standard calls captions "subtitles".

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Sources