The Redlining XTension keeps information about any deletion or addition made to an article. This includes features such as Highlighted and Tracked Text (Hidden Text). This information is saved with the article until the changes are Accepted or Rejected.

More Information:
WebHub does not support Redlining information. This is the reason an article with Redlining (Tracking and Highlighting) loses all tracking information when checked out in WebHub, You will be warned when an article you want to check out via WebHub if the article contains any Redlining.