App.js

const parent=React.createElement('div',{id:'parent'},
                                 [React.createElement('div',{id:'child1'},
                                                      [React.createElement('h1',{},"i am h1"),
                                                       React.createElement('h2',{},"i am h2")]),
                                  React.createElement('div',{id:'child2'},
                                                      [React.createElement('h1',{},"i am h1"),
                                                       React.createElement('h2',{},"i am h2")])
                                 ])


const heading=React.createElement("h1",{id:'heading'},"Hello World from React");  
const root=ReactDOM.createRoot(document.getElementById('root'));
    
root.render(parent);