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Frontend Performance Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
hard
Frontend Performance
What does the metric.id field on a reported Web Vitals metric protect against?
A
It has no practical purpose
B
It's a unique identifier per metric instance, useful for deduplicating if the same metric gets reported more than once
C
It identifies which USER triggered the metric
D
It's required for the metric to be measured at all
Check Answer