# Website Resilience

> Graceful-failure essentials for a website — custom error pages with correct status codes, 503 maintenance pages, graceful degradation without JavaScript, web app manifest, and uptime monitoring. Use when building error pages, offline behaviour, or resilience of a site.

- Skill: `paulgrape/website-resilience` (Agent Skill)
- Install (CLI): `npx skillmds@latest add paulgrape/website-resilience`
- Raw SKILL.md: https://api.skillmd.com/api/skills/paulgrape/website-resilience/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: paulgrape (https://skillmd.com/u/paulgrape)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/paulgrape/website-resilience

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# Website resilience

Graceful failure — error pages, offline, redirects. Curated from the
[Website Specification — Resilience](https://specification.website/checklist/) (CC BY 4.0).

## Required

- Custom error pages (404, 500) that return the correct HTTP status, explain what went wrong in plain language, and offer a way forward without leaking implementation details.

## Recommended

- Maintenance pages return `HTTP 503` with a `Retry-After` header.
- Graceful degradation: core content and primary navigation keep working when JavaScript fails.
- Web app manifest (`manifest.json`) declaring name, icons, start URL, theme colour, display mode.
- Monitor uptime from outside your own infrastructure; run a status page on a separate host.

## Optional

- Service worker serving a cached offline fallback page.

Full item list and rationale: https://specification.website/checklist/