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Message: <blockquote data-quote="Codes Magic" data-source="post: 87" data-attributes="member: 1">In JavaScript, the `onmessage` event handler in a Web Worker is executed as a task on the worker's event loop. However, the event loop is not the same as the main thread's event loop.When a message is posted to the worker using `postMessage()`, the worker's event loop is notified, and the `onmessage` event handler is added to the worker's task queue.Here's what happens next:1. *Microtask queue*: The worker's task queue has a microtask queue that runs before the macrotask queue. However, the `onmessage` event handler is not a microtask.2. *Macrotask queue*: The `onmessage` event handler is executed as a macrotask, which means it runs after any pending macrotasks in the worker's task queue.Now, if there's a pending macrotask in the worker's task queue, it will run before the `onmessage` event handler. This is why the `onmessage` event handler might seem to execute after a macrotask.To illustrate this, consider the following example:[CODE=javascript]// In the workerself.onmessage = (event) => {  console.log('onmessage');};// Post a message to the workerself.postMessage('Hello');// Add a macrotask to the worker's task queuesetTimeout(() => {  console.log('Macrotask');}, 0);[/CODE]In this example, the output will be:```Macrotaskonmessage```The `onmessage` event handler is executed after the macrotask because the macrotask was added to the worker's task queue before the `onmessage` event handler.Keep in mind that the order of task execution can vary depending on the specific use case and the worker's task queue.</blockquote>

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