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technical

404 error

Page not found.

Definition

A 404 status code tells browsers and crawlers that the requested URL doesn't exist. Common, harmless. The problem is when expected pages return 404 unexpectedly.

Related terms

Core Web Vitals

Google's user experience metrics.

LCP

Largest contentful paint — page load metric.

CLS

Cumulative layout shift — visual stability metric.

INP

Interaction to next paint — responsiveness metric.

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