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React never attaches your onClick to the button; one listener per event type on the root container finds the target's fiber, walks the component tree to collect your handlers, and gives their updates a priority.
A click reaches React through the listener createRoot put on the container. dispatchDiscreteEvent sets the update priority to Discrete, so setCount gets SyncLane. The update is…
React doesn't attach your onClick to the button. When you call createRoot(container), it puts one capture and one bubble listener per native event type on the root container. On a…