I just noticed that in this notebook, when I view it in Chrome, all is good. When I view it in Safari (yuck), the arrow-heads aren’t displayed.
Please don’t waste your time explaining things to me that I can read about elsewhere - just point me in the right direction. I promise I’ll do my homework, I’m just not sure exactly what to look up.
I’m starting to understand that I’ll need to learn more about what various browsers do and don’t support - I’m a guy coming from the MATLAB / R world but very much prefer an online medium like Observable, especially for teaching / sharing purposes and minimizing dependency issues.