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CustomElementRegistry

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The CustomElementRegistry interface provides methods for registering custom elements and querying registered elements.

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

Methods

CustomElementRegistry.define(): Defines a new custom element.
CustomElementRegistry.get(): Returns the constuctor for the named custom element, or undefined if the custom element is not defined.
CustomElementRegistry.whenDefined(): Returns a promise that will be fulfilled when a custom element becomes defined with the given name. (If such a custom element is already defined, the returned promise is immediately fulfilled.)

Examples

Browser compatibility

Feature	Firefox (Gecko)	Chrome	Internet Explorer	Opera	Safari
Basic support	(Yes)	54	No support	41	10.1

Feature	Firefox Mobile (Gecko)	Chrome for Android	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	54	No support	41	10.1

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https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry