A Simple Diff-Based Copyediting Tool, by James Somers source code

* Paste the textwhatever you want to edit in the copyediting area. When you’re ready to start making changes, hit “mark start.”

* There are three basictypes of changes you can make: insertions, deletions, and comments.

* [Mouse over the pink dot]•.

* To make a comment, just highlight some text you want to comment on and hit the “[” key. It’ll surround your selection in brackets. Put your comment in the parentheses that follow.

* When you're done, hit the “finish” button to get a link to a page with the final marked-up version.

* You can easily remove a comment by clicking on it in the preview area.