Description
In my ongoing work uploading my back catalog of speaking notes, I came across some which included Greek and Hebrew text. This text exposed some gaps in font support.
Greek
My text uses polytonic Greek, which uses diacritical marks not used in modern Greek. Hereās an example of how Dynalist renders it:
Note how some of the letters are rendered in a different font. I circled three examples in my screenshot and left the rest un-circled.
In my opinion, this is a minor issue because: a) the text remains legible, b) few users will likely need these diacritical marks, and c) supporting the entire range of the Greek script would increase the font download size. However, Iām bringing this up in case thereās an easy fix that I havenāt thought of, and because the next issue, below, is related but more serious.
Hebrew
More serious is this screenshot of Hebrew text, which needs no highlighting to show the problem: 
For reference, hereās how it should look, albeit in a different font: 
The issue here is that some of the code points for two of the cantillation marks (ta`amei ha-mikra) arenāt supported (the ones below the letters which look a little like slashes and backslashes). Again, these are rather uncommon. To my knowledge, theyāre only used in Hebrew Bibles, and not in other Hebrew texts, so most of your users wonāt need them. However, in this case, the text is hard to read as it currently is. I can work around this issue by simply deleting the cantillation marks since I donāt need them for my purposes, but I thought Iād raise the issue, anyway.
Environment
Iām on Chromium on Ubuntu Linux.
Additional Information
In case you want to see a live example, you can. I havenāt shared it publicly, but Iām quite OK with a dev using privileged means to access it.