const Hello = () => <span id="hello-span">hello</span>; const World = () => ( <> <div id="hello-parent-div"> <span id="hello-parent-span"> <Hello id="hello-component" />!<span>subspan!</span> </span> </div> <h2>world</h2> </> ); return ( <div id="r"> <Hello id="hello-root-component" /> <World id="world-component" /> <World id="world-component-2" /> </div> );