Arabic text in italic is not supported for all fonts. For exemple if I set the font to Roboto italic, square boxes are displayed instead of arabic characters.
Steps to reproduce:
Just have some arabic text in your page that its font is set to (Roboto, serif…) + italic.
https://www.w3schools.com/code/tryit.asp?filename=GD39H84DGT9F
Expected result (Arial italic), actual result (Roboto italic)
Operating System and Brave Version
Windows Version 10.0.18363 Numéro 18363
Version 1.5.113 Chromium: 80.0.3987.149 (Official Build) (64-bit)