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// https://w3c.github.io/frame-timing/#performancecompositetiming

[
    RuntimeEnabled=FrameTimingSupport  // Experimental flag
] interface PerformanceCompositeTiming : PerformanceEntry {
    // TODO(philipj): This is named |sourceFrameNumber| in the spec.
    readonly attribute unsigned long sourceFrame;
    // TODO(philipj): serializer = {inherit, attribute};
};