Arabic-script typography on the web can also be complicated. I did a review/demonstration of some fonts and issues that they may need to handle:

https://www.theobeers.com/arabic-font-tests/

The tl;dr for people who want Arabic-script text to look ok in their projects, without making it a focus, is that a modern "native font stack" (à la Bootstrap) does a fine job. I just wouldn't recommend allowing things to fall straight back to "serif" or "sans-serif."