An In-Depth Guide To Measuring Core Web Vitals
Smashing Magazine
APRIL 19, 2021
Total Blocking Time (TBT) is a good proxy for FID when using a testing tool without any direct user interaction, but also keep an eye on Time to Interactive (TTI) when looking at FID. not to mention older browsers (Internet Explorer — hurry up and fade out would you!) Cumulative Layout Shift (CLS). CrUX is Chrome only.
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