Ideally the app shouldn't work differently based on what OS the browser is running on (especially since Chrome OS is more popular than macOS these days, and tha

Ideally the app shouldn't work differently based on what OS the browser is running on (especially since Chrome OS is more popular than macOS these days, and that's a Linux. Not to mention Android and iOS which behave differently too.). Most distros offer font packages that can get you the stock Microsoft fonts if you're missing those, although these days I think it would be safest for the server to serve any fonts that aren't on all three platforms by default. On Ubuntu, you can do `apt-get install -y ttf-mscorefonts-installer` to get them.