The Internationalization Working Group has published the following three Draft Notes:
Uighur Layout Requirements
Urdu Layout Requirements
Perso-arabic Kashmiri Layout Requirements

These documents respectively describe or point to requirements for the layout and presentation of Uighur text, Urdu text, and text in Kashmiri using the Perso-arabic script when they are used by Web standards and technologies, such as HTML, CSS, Mobile Web, Digital Publications, and Unicode.
https://www.w3.org/news/2024/draft-notes-uighur-urdu-and-perso-arabic-kashmiri-layout-requirements/