Cool stuff! What was the reason for you to make this?
I find myself opening and using the web console to do simple tasks like string manipulation, maths, sorting often. I wanted a dedicated and persistent way to do this. And also just a place to keep notes, urls and stuff. So I made this "literate programming" notepad. I'm also former Emacs user, and I like the lisp scratch buffer there, which is similar.
I'm also building a web-based literate programming environment called Starboard[1] that's probably a hundred times the amount of code (but then it has additional features such as top-level await, plugin, and Python support).
Consider supporting lit-html[2] literals instead of strings for HTML output, it works really well in notebook environments.
One more thing you can consider: a esm tagged literal that uses import(), you can then use ES Module imports to dynamically load code. Here's a blog post about that approach [3]
[1]: https://starboard.gg [2]: https://lit-html.polymer-project.org/ [3]: https://2ality.com/2019/10/eval-via-import.html