Well duh, this is how codepen works!

Try this:

1. Open one of your codepens

2. Now open the same codepen in a different window so you have two open at the same time

3. Now type in one window

4. Watch it s̶e̶n̶d̶ ̶y̶o̶u̶r̶ ̶c̶h̶a̶n̶g̶e̶ ̶t̶o̶ ̶t̶h̶e̶ ̶s̶e̶r̶v̶e̶r̶ ̶t̶o̶ magically update all other clients

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Also, notice how your browser never had to download typescript, sass, babel, tailwind, etc...?

That's because what you type gets sent to the server to transform it into compiled html.