[spartanatreyu]

React's hello world:

```js

<div id="root"></div>

<script>

import React from 'https://esm.sh/react@19';

import ReactDOM from 'https://esm.sh/react-dom@19/client';

const root = ReactDOM.createRoot(document.getElementById('root'));

root.render(<h1>Hello, world!</h1>);

</script>

```

---

HTML's hello world:

```html

<h1>Hello, world!</h1>

```

---

JS's hello world:

Nothing, it was already done in HTML