★ NEW EXHIBITS APPEAR WITHOUT WARNING ★ SUBMIT ONLY A DOMAIN — OUR ROBOT FINDS /404 ★ SOFT 404s MAY BE OVERRIDDEN BY THE CURATOR ★

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React treats the missing page like a documentation page

A plain Not Found heading appears inside the familiar documentation shell with a sidebar and resource footer.

react.dev/404 — desktop + phone evidence
Desktop viewport · 1440 × 900
react.dev: A plain Not Found heading appears inside the familiar documentation shell with a sidebar and resource footer., captured at a desktop viewport
Phone viewport · 390 × 844
react.dev: A plain Not Found heading appears inside the familiar documentation shell with a sidebar and resource footer., captured at a phone viewport

HTTP 404

Domain: react.dev

Captured: August 31, 2026

Views: desktop + phone capture

  • developer-tools
  • navigation
  • copywriting

Curator's note

The error retains the surrounding learning navigation instead of sending the reader to an unrelated splash screen. A short reporting invitation acknowledges that the missing page might be a mistake worth fixing.

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mailchimp.com — HTTP 404
Mailchimp illustrated 404 page

Mailchimp admits it is lost

A restrained utility page explains the dead end and offers one bright route back to the homepage.

  • copywriting
  • minimal
  • helpful
microsoft.com — HTTP 404
Microsoft 404 page with a centered apology and site navigation

Microsoft stays strictly business

One centered sentence explains the error while the full corporate navigation remains available above and below.

  • minimal
  • corporate
  • navigation
news.yahoo.co.jp — HTTP 404
Yahoo Japan News 404 page with a small gray robot illustration

Yahoo Japan News sends a small robot

A gray mascot and a compact Japanese message sit beneath the familiar news navigation and search bar.

  • character
  • international
  • navigation
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