# 404 Page

> 404 Page is an Agent Skill for development published in the thedaviddias/Front-End-Checklist repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Use when reviewing templates, rendered HTML, or shared components related to Create a custom 404 error page. Validate the final browser-facing markup, not just the source framework abstraction.

- Skill name: `404-page`
- Category: [Development](https://www.openparable.com/skill/development/1)
- Source: https://github.com/thedaviddias/Front-End-Checklist/blob/HEAD/skills/404-page/SKILL.md
- Repository: thedaviddias/Front-End-Checklist (73,218 GitHub stars when collected)

## SKILL.md

# Create a custom 404 error page

A generic browser 404 page causes users to leave immediately—a well-designed custom page provides recovery paths and keeps users engaged with your site.

## Quick Reference

- Custom 404 pages retain users who encounter broken or moved links
- Include search, navigation, and links to popular content
- Maintain consistent branding and site design
- Track 404 errors to identify and fix broken links
- Return a real HTTP 404 so the page is not treated as a soft 404

## Check

Verify that this website has a custom 404 error page with helpful navigation options. Confirm the route returns HTTP 404 and not a branded page with a 200 response.

## Fix

Create a user-friendly 404 page with search functionality and links to important pages. Ensure the server or framework returns status code 404 so the page does not become a soft 404.

## Explain

Explain how custom 404 pages help retain users who encounter broken links and why returning 200 for missing pages creates soft-404 indexing problems.

## Code Review

Review templates, server-rendered HTML, and shared components that output markup related to Create a custom 404 error page. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.

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For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.

Rule page: https://frontendchecklist.io/en/rules/html/404-page

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Source: https://www.openparable.com/skill/development/404-page (OpenParable). Cite the canonical URL above.