Topic: accessibility
-
Accessibility fundamentals: perceivable, operable, understandable, robust
WCAG organises requirements under four principles; the most common failures on content sites are missing text alternatives, colour-only signalling, keyboard traps, low contrast and unlabeled controls.
-
Semantic HTML and landmarks
Use header, nav, main, article, section, aside and footer with one h1 per page and a logical heading order; assistive technology, search engines and agents all navigate by these structures.
Machine-readable: JSON