Boilerplate React fiddle gives warnings and errors in fiddle Console

[chrisjj]

https://jsfiddle.net/boilerplate/react-jsx shows in fiddle Console:

"You are using the in-browser Babel transformer. Be sure to precompile your scripts for production - https://babeljs.io/docs/setup/"
<a class='gotoLine' href='#"Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot"'>"Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot"</a>
["Warning: Each child in a list should have a unique \&quot;key\&quot; prop.%s%s See https://reactjs.org/link/warning-keys for more information.%s", "

Check the render method of `TodoApp`.", "", "
    at li
    at TodoApp (&lt;anonymous&gt;:3:5)"]

Or is that warnings plural. Hard to tell... EDIT: browser console says 2 warnings and 2 errors:

of which one error is absent from the fiddle Console.

PS The lack of line wrap is really painful. Please add my vote for this to be fixed.