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Which of the following is an interface?

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Which of the following is an interface?

(a) Time

(b) Timing

(c) Performance

(d) PerformanceTiming

The question was asked in class test.

I would like to ask this question from Invocation of the Performance Object topic in chapter Invocation and Performance Navigation of JavaScript

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Correct choice is (d) PerformanceTiming

The explanation is: Performance.timing read-only property returns a PerformanceTiming object containing latency-related performance information. PerformanceTiming is an interface in JavaScript.

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