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A New Best Practice for User Friendly 404 Page Design?

I clicked a link from a 2-year-old Hacker News thread, and Nielsen Norman Group served up a 404 page. On that 404 page, NN/G served up an educational message for visitors who arrive from ChatGPT, Claude, or another LLM:

(Did an AI chat send you here? They sometimes get URLs wrong or hallucinate nonexistent NN/G articles.)

Is this a new best practice for 404 page design?

A Screenshot of a browser showing NN/G's 404 page, including the quote mentioned in this post.
Afterword

Afterword

I was surprised that this link broken within 2 years. Cool URIs don’t change, which NN/G has traditionally agreed with:

Any URL that has ever been exposed to the Internet should live forever: never let any URL die since doing so means that other sites that link to you will experience linkrot.

Fighting Linkrot, by Jakob Nielsen

In their defense, the old URI offered a 3-day course, and NN/G now only offers a 1-day course. Plus, the 404 page does use plain language and constructively offers steps I can take.

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