You opened this page directly from your filesystem (the URL starts with
file://). Modern browsers block JavaScript modules from
file:// for security reasons, so Plöttr's tools can't load.
Identical code, hosted on GitHub Pages, nothing to install:
https://evompmi.github.io/plottr
You need a tiny local web server. On macOS or Linux, Python 3 is already installed and one command does it:
Terminal, hit Enter.
cd (note the trailing space), then drag the Plöttr folder onto the
Terminal window — the path fills in automatically. Press Enter.
python3 -m http.serverLeave the Terminal window open while you use Plöttr — closing it stops the local server. Ctrl + C in Terminal shuts it down cleanly.
No Python? Any static-file server works: npx serve (if you have Node.js
installed), VS Code's "Live Server" extension, or simply upload the folder to any static
host.