[omegote]

The case here is that, if it were up to nowadays frontend developers, it would not be possible to write simple JavaScript code in notepad to quickly run in the browser. The frontend scene has evolved to become an unmanageable monster of cargo-cult programming, unnecessary complexity, infinite scaffoldings and huge node_module folders, and frontend developers are proud of that complexity. They enjoy running npm init and tens of initialization commands before even writing a single line of code of their own.

And all of that goes against the ease of access the OP post seems to request.

[aspyct]

Yes you can: <script>. It still works, you know.