CustomElementRegistry

The CustomElementRegistry interface provides methods for registering custom elements and querying registered elements. To get an instance of it, use the customElements property. To create a scoped registry, use the CustomElementRegistry() constructor.

Constructor

• CustomElementRegistry()
  • : Creates a new CustomElementRegistry object, for scoped usage.

Instance methods

• define()
  • : Defines a new custom element.
• get()
  • : Returns the constructor for the named custom element, or undefined if the custom element is not defined.
• getName()
  • : Returns the name for the already-defined custom element, or null if the custom element is not defined.
• upgrade()
  • : Upgrades a custom element directly, even before it is connected to its shadow root.
• initialize()
  • : Associates a scoped registry with a DOM subtree, setting the custom element registry on each inclusive descendant and upgrading any custom elements.
• whenDefined()
  • : Returns an empty Promise that resolves 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

See the Examples section in our guide to using custom elements.

Specifications

Browser compatibility