Worker
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The EventTarget.addEventListener() method registers the specified listener on the EventTarget it's called on.
The EventTarget.addEventListener() method registers the specified listener on the EventTarget it's called on. The event target may be an Element in a document, the Document itself, a Window, or any other object that supports events (such as XMLHttpRequest).
MDN
Dispatches an Event at the specified EventTarget, invoking the affected EventListeners in the appropriate order.
Dispatches an Event at the specified EventTarget, invoking the affected EventListeners in the appropriate order. The normal event processing rules (including the capturing and optional bubbling phase) apply to events dispatched manually with dispatchEvent().
MDN
The AbstractWorker.onerror property represents an EventHandler, that is a function to be called when the error event occurs and bubbles through the Worker.
The AbstractWorker.onerror property represents an EventHandler, that is a function to be called when the error event occurs and bubbles through the Worker.
MDN
The Worker.onmessage property represents an EventHandler, that is a function to be called when the message event occurs.
The Worker.onmessage property represents an EventHandler, that is a function to be called when the message event occurs. These events are of type MessageEvent and will be called when the worker calls its own postMessage() method: it is the way that a Worker has to give back information to the thread that created it.
MDN
The Worker.postMessage() method sends a message to the worker's inner scope.
The Worker.postMessage() method sends a message to the worker's inner scope. This accepts a single parameter, which is the data to send to the worker. The data may be any value or JavaScript object handled by the structured clone algorithm, which includes cyclical references.
MDN
Removes the event listener previously registered with EventTarget.addEventListener.
Removes the event listener previously registered with EventTarget.addEventListener.
MDN
The Worker.terminate() method immediately terminates the Worker.
The Worker.terminate() method immediately terminates the Worker. This does not offer the worker an opportunity to finish its operations; it is simply stopped at once.
MDN
The Worker interface represents a background task that can be easily created and can send messages back to their creators. Creating a worker is as simple as calling the Worker() constructor, specifying a script to be run in the worker thread.
Of note is the fact that workers may in turn spawn new workers as long as those workers are hosted within the same origin as the parent page. In addition, workers may use XMLHttpRequest for network I/O, with the exception that the responseXML and channel attributes on XMLHttpRequest always return null.
MDN