Edge delivery system AEM Migration impact on Adobe Target Activities and Experience Fragments

[Paturi]

Hello, 

Our organization is working on a migration of AEM from traditional 6.5.19, to Edge delivery service (AEM), We are assuming there will be changes to experience fragment delivery and Change in site level CSS classes and structure of the website HTML. Does anyone who might have handled the migration know about the impact it might have on existing personalization and AB tests and any suggestions on how to handle the switchover. I'd appreciate any insights or first hand information about this change. 

Thanks, 
Ravi Paturi