The Web HIG is an open contract for interaction, state, accessibility, and performance. It sits beside WCAG and a visual design system. It does not prescribe a look.

Rule IDs are shared by people and coding agents. A quick reference, practical modules, and the full specification are published from the same repository.

Content, commerce, application, and auth each carry their own rule set
Guardrails can be checked in CI, not only in a design review

Markdown · YAML · Node.js

Specification (opens in a new tab)