These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: createPortal Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component. The first argument (child) is any renderable React child, such as an element, string, or fragment.
![Portals – React](https://cdn-ak-scissors.b.st-hatena.com/image/square/b2c712cc98dd4b4358911c413bad77e850529eee/height=288;version=1;width=512/https%3A%2F%2Flegacy.reactjs.org%2Flogo-og.png)