React基础中的单一标签包裹的问题

<div id="example">
</div



 function HelloMessage(props1) {
     return (<h1>Hello {props1.name}!</h1>);
}
const element = <HelloMessage name="maomin"/>;
 
 ReactDOM.render(
     element,
     document.getElementById('example')
);

return (
 <h1>Hello {props1.name}!</h1>
 <h1>I am your grilfriend!</h1>
 );

 return (
 <div>
 <h1>Hello {props1.name}!</h1>
 <h1>I am your grilfriend!</h1>
 </div>
 );

 return (
 <<React.Fragment>>
 <h1>Hello {props1.name}!</h1>
 <h1>I am your grilfriend!</h1>
 </<React.Fragment>>
 );