I thought it should be extremely portable ("everything just works, it's native"), but it doesn't work on iOS 9.3.6. It doesn't even let me input text into the textarea...
A natural extension seems to be a source code editor with syntax highlighting, like those used in https://marimo.io/, Jupyter, https://plutojl.org/ and other notebook-like Web editors.
A natural extension seems to be a source code editor with syntax highlighting, like those used in https://marimo.io/, Jupyter, https://plutojl.org/ and other notebook-like Web editors.