The AbstractWorker interface of the Web Workers API is an abstract interface that defines properties and methods that are common to all types of worker, including not only the basic Worker, but also ServiceWorker and SharedWorker. As an abstract class, you don't directly interact with AbstractWorker.


The AbstractWorker interface doesn't inherit any properties.

Event handlers

An EventListener which is invoked whenever an ErrorEvent of type error bubbles through the worker.


The AbstractWorker interface doesn't implement or inherit any methods.


As an abstract interface, you won't directly use AbstractWorker in your code. Instead, you'll interact with either Worker or SharedWorker, both of which inherit the properties of AbstractWorker.

This code snippet demonstrates the creation of a new Worker using the Worker() constructor; it also shows how to then send a message to the worker.

var myWorker = new Worker('worker.js');

first.onchange = function() {
  myWorker.postMessage([first.value, second.value]);
  console.log('Message posted to worker');

The worker's code is loaded from the file "worker.js". This code assumes that there's an <input> element represented by first; an event handler for the change event is established so that when the user changes the value of first, a message is posted to the worker to let it know.

You can find more examples on the MDN Web Docs GitHub repository:


Specification Status Comment
HTML Living Standard
The definition of 'AbstractWorker' in that specification.
Living Standard No change from Unknown.

Browser compatibility

BCD tables only load in the browser

See also