service-manual checked
GOV.UK Service Manual: Building a robust frontend using progressive enhancement
Documents HTML-first services, CSS and JavaScript failure conditions, feature detection, testing on lower-powered devices, preserving core functionality when JavaScript fails, and using other channels only when core functionality cannot be provided without JavaScript.
Pattern Decisions This Source Supports
| Pattern | Supported decision | Required contract | Claim note |
|---|---|---|---|
| Graceful degradation | Choose graceful degradation when users stay on the same surface and the core task continues with fewer capabilities. | The baseline path can complete the same core task or the interface explicitly says why it cannot. | GOV.UK documents baseline HTML, JavaScript failure risks, and preserving core functionality when enhanced layers fail. |
Evidence Role
This source is treated as service-manual evidence. Use it to validate the decision rules above, not as a visual style reference.
Publisher: Government Digital Service. Last checked: .