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createPortal() ↔ ReactDOM API Escape Hatch fn to render child Element to any container Element other than parent

Portal​

ReactDOM API Escape Hatch to render children outside Component Hierarchy of Parent Component

create root level container to render modal for Portal 

<html\>
  <body\>
    <div id="root"\></div\>
    <div id="modal"\></div\>
  </body\>
</html\>

References​