- A set of metrics suggested important for a great user experience on the Web. The Web Vitals initiative was started in 2020 by Google. The “Core Web Vitals” include Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). Interaction to Next Paint (INP) is a pending metric to replace First Input Delay (FID) in 2024. ↑ web.dev/vitals
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