gistpad-playground

index.html

<h1>Testing</h1>

<div id="root">
    &nbsp;
</div>

playground.json

{
  "scripts": [
    "react",
    "react-dom",
    "https://cdnjs.cloudflare.com/ajax/libs/typescript/3.7.2/typescript.min.js"
  ],
  "styles": []
}

script.js

console.log('testing')

ReactDOM.render(
    <h1>Hello, world!</h1>,
    document.getElementById('root')
);

style.css

h1 {
    color: red;
    font-family: sans-serif;
}