Repo

Adding to actual DOM

ReactDOM

React Suspense React 16.6 added a <Suspense> component that lets you
"wait" for some code to load and declaratively specify a loading state
(like a spinner) while we're waiting:

Portals

https://reactjs.org/docs/portals.html

React Portals provide a first-class way to render children
into a DOM node that exists outside the DOM hierarchy of the parent
component.

https://reactjs.org/docs/concurrent-mode-suspense.html

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