Typography accessibility

The top of the source hierarchy. A typographic rule that fails an accessibility criterion is wrong no matter which book it came from.

1. When to invoke

• Any body text, UI text, or editorial text that carries meaning.
• Contrast, zoom, spacing overrides, or text resizing questions.
• Claims that a design is accessible.
• Dyslexia, low vision, ageing eyes, or cognitive-load requirements.
• Text rendered as an image, or styled with CSS that may break assistive tech.

Always co-load with body-text-and-reading and ui-component-typography.

2. Required context