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Overview

We track Largest Contentful Paint (LCP), First Input Delay (FID) & Cumulative Layout Shift (CLS) as part of Web Vitals.

Tools

Cumulative Layout Shift (CLS)

You can supply the key pair cls=true to the query string of any page on github.com when in staff mode to have the page draw red rectangles on elements that count towards the cumulative layout shift number.