spec 1 linked patterns checked
MDN HTTP 404 Not Found
Documents 404 as the client error response when the server cannot find the requested resource, distinguishes temporary or permanent ambiguity from 410 Gone, and describes custom 404 pages.
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What this source can teach
Use this source to check a technical or accessibility requirement against its exact wording and scope.
- 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.
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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. | MDN documents 404 as the response when the server cannot find the requested resource and distinguishes it from 410 Gone. |
Evidence Role
This source is treated as spec evidence. Its value comes from the specific claims and setting described above.
Publisher: MDN Web Docs. Last checked: .