freecodecamp: React step by step to practice Create a Simple JSX Element " const JSX = <h1>Hello JSX!</h1>; " Create a Complex JSX Element " const JSX=<div> <h1></h1> <p></p> <ul> <li></li> <li></li> <li></li> </ul> </div>; " Add Comments in JSX " const JSX = ( /* here in first time */ <div> <h1>This is a block of JSX</h1> <p>Here 's a subtitle</p> </div> ); " Render HTML Elements to the DOM " const JSX = ( <div id= 'challenge-node' > <h1>Hello World</h1> <p>Lets render this to the DOM</p> </div> ); // change code below this line ReactDOM.render(JSX,document.getElementById( 'challenge-node' )); " Define an HTML Class in JSX " cons...