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