pattern-library checked
GOV.UK page not found pages
Documents 404 page copy, page title and H1 requirements, service contact guidance, reasons users may reach a missing page, link-testing duties, and exclusions such as breadcrumbs, jargon, humor, and red warning text.
Pattern Decisions This Source Supports
| Pattern | Supported decision | Required contract | Claim note |
|---|---|---|---|
| Page not found page | Choose page not found page when the requested route, page, file, object URL, or deep link does not resolve to a valid destination. | The page loads as a stable destination instead of redirecting users without explanation. | GOV.UK documents page-not-found use cases, no-blame copy, page title and H1, contact guidance, link testing, and exclusions such as technical jargon and breadcrumbs. |
Evidence Role
This source is treated as pattern-library evidence. Use it to validate the decision rules above, not as a visual style reference.
Publisher: GOV.UK Design System. Last checked: .