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One click on "Add" in the shopping list app, followed from the root listener through batched sync updates, rendering, keyed reconciliation and the commit to the moment the new item is painted.
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…
createRoot(el).render(<App/>) renders nothing synchronously. It builds the root objects, attaches the event listeners, queues one DefaultLane update and books a microtask. The…