PerformanceMeasureOptions.idl

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typedef double DOMHighResTimeStamp;

// https://w3c.github.io/user-timing/#ref-for-dom-performancemeasureoptions-1
dictionary PerformanceMeasureOptions {
    any detail;
    (DOMString or DOMHighResTimeStamp) start;
    DOMHighResTimeStamp duration;
    (DOMString or DOMHighResTimeStamp) end;
};