platform-guideline checked
EPA Page Not Found web standard
Defines page not found pages for broken links and requires a clear page title, a way to find information, homepage or search links, domain homepage link, and additional helpful customer information.
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. | EPA requires clear page-not-found title content, a way to find information, homepage or search links, and other helpful information. |
Evidence Role
This source is treated as platform-guideline evidence. Use it to validate the decision rules above, not as a visual style reference.
Publisher: United States Environmental Protection Agency. Last checked: .