HR Diagram of Your Own Image (StackImages): a copy to put on your own web site
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1. Upload this whole HRDiagram folder to any directory of your web site, unchanged.
   The page is HRDiagram/index.html. Nothing to install or run on the server: these
   are ordinary static files.

2. Open it through the web server (https://...), not from your disk (file:///...):
   browsers do not run the page's background worker from local files.

3. No server settings are needed. The page works whatever content types the server
   sends for its .wasm and .whl files (application/octet-stream is fine), as long as
   .js, .html and .css have their usual types.

Students' images are read by Python running in their browser and are never uploaded;
the page fetches nothing from other sites. The diagram is shown as a data: image, so
a Content-Security-Policy must allow img-src data:.

Built from https://github.com/PrincetonUniversity/StackImages
(the same page as https://princetonuniversity.github.io/StackImages/HRDiagram/).
