Which option is better for achieving append-only behavior between createPortal and appendChild in React?

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createPortal is a better option for achieving append-only behavior in React as it allows you to append a child node to a DOM node that exists outside the current React component hierarchy. This means that even if you pass the control to a higher-level component, the child node appended using createPortal will not be unmounted or removed. In contrast, appendChild adds a child node to an existing DOM node within the same hierarchy, and if the parent node is removed, the child nodes will be removed as well.