– render() function is employed to update the UI. You can update the UI by creating a new element and send it to ReactDOM.render().
– React elements are stable and once you build an element, you cannot change its properties. So, elements are like a single frame and it represents the UI at some point.
– ReactDOM.render() manages the content of the container node you transfer and if there is any DOM element already existing in it then it would be followed when first called.
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