Here's What Diffs Look Like for a Document in Google Docs

Here's what diffs look like in Google Docs & Spreadsheets:

"Diffs" are a comparison of two past revisions of a page. Here you can see that new lines appear with Green highlights, and -- if you look very closely -- the character I _removed_ (in the first line) is indicated in with gray text.

Link: http://docs.google.com/