Tools bookmarks page
This is a workaround for me not really using bookmarks that much (they're hard to invoke on mobile).
Preview reStructuredText
https://waldyrious.net/rst-playground docutils running in the browser through Pyodide.
https://snippets.documatt.com/ Uses Sphinx, so it's able to preview more text roles (like :file:`foo.exe`). Runs in-browser (somehow). A playground hosted by Documatt.