platform-guideline 1 linked patterns 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.
Read with a purpose
What this source can teach
Use this source to understand a platform convention and the setting it was designed for.
- Start with the original. Open the source and find the guidance or example relevant to your task.
- Trace the connection. Use the claim notes below to see how this site applies the source to specific patterns.
- Check the setting. Compare the source's platform, people, and constraints with your own decision.
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. |
Comparisons supported by this source
- Page not found page vs service unavailable page vs error state vs empty state
EPA requires a clear page title, a way to find information, homepage or search links, domain homepage link, and additional helpful information.
Evidence Role
This source is treated as platform-guideline evidence. Its value comes from the specific claims and setting described above.
Publisher: United States Environmental Protection Agency. Last checked: .