Web Reference: Feb 22, 2026 · For both kinds of custom element, the basic steps to create and use them are the same: You first implement its behavior by defining a JavaScript class. You then register the custom element to the current page. You can also create scoped registries to limit definitions to a particular DOM subtree. Mar 26, 2021 · To create a custom element, we need to tell the browser several details about it: how to show it, what to do when the element is added or removed to page, etc. That’s done by making a class with special methods. There are two models for implementing classes and instances in JavaScript: the prototyping way, and the closure way. Both have advantages and drawbacks, and there are plenty of extended variations.
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