We are using Kendo UI editor in our project and one of our requirement was to implement the inline comment feature. 

I have implemented a extension to Kendo editor using JS inbuild functions and CSS to create a Inline comments for any text in the editor.

User can select any text in the kendo editor and add review comments against it. Other user can see the comments, Reply to the comments or add, delete, edit their own comments.

User can clear all the comments on click of one button.