The read-only target property returns the associated event's last target which is the node onto which the event was last dispatched.

A Node onto which the event was last dispatched.

Or null if the Node is disconnected from the document's DOM or is in the shadow DOM.

The target property can be used when observing event-timing entries (PerformanceEventTiming). For example, to log and measure events for a given last target only.

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    if (entry.target && entry.target.id === "myNode") {
      const delay = entry.processingStart - entry.startTime;
      console.log(entry.name, delay);
    }
  });
});

// Register the observer for events
observer.observe({ type: "event", buffered: true });