Web Reference: Feb 22, 2026 · The code below shows how this works using the example of an autonomous custom element that has an internal state "collapsed". The collapsed state is represented as a boolean property (with setter and getter methods) that is not visible outside of the element. The constructor function is basically a standard JavaScript object; you define private attributes inside of it, and public attributes are attached to the this variable. Basically, this approach combines the Crockfordian approach with standard JavaScript objects to create a more powerful class. In this tutorial, you will learn about the JavaScript custom events such as creating a custom event and dispatching it.
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