To see the demo, start a web server and load this page (e.g., `npx http-server` and navigate to http://127.0.0.1:8080/demos/fonts/core.html).

Using vexflow-core.js allows your webpage to load a small initial bundle. It will load fonts on demand when you call await Vex.Flow.fetchMusicFont(fontName).

Open your browser's developer tools and choose one of the fonts below. You will see that a font module is downloaded when needed:

Bravura   Leland   Gonville   Petaluma  

See: core-with-promise.html if you prefer to use Promises instead of await.
See: all.html