Angular preview page with diffftool

has a web page that allows the user of the user to view the changes made.

The page has a grid with data and the user can edit each row. In the preview, the user wants to see what he changed.

Something like this grid http://www.jeasyui.com/demo/main/index.php

So I need to implement some kind of preview that shows the differences. For example, highlighting deleted content in red, or new content in green, etc.

I have searched the internet for this problem, but I was unable to find anything in this best practice.

Where can I read about best practices related to creating a preview page with the option to highlight changes made by the user (where the user can check what things they have changed, removed or added)