This is a screenshot to simulate what Perameles might look like in use. You can see this in action for yourself by viewing the PRML/HTML hybrid sample (known to work in Mozilla & Firefox; I don't know if it will work in MS Internet Explorer, which is funny with CSS). This was done with two files which are exactly identical except for the CSS to which they link, as a modest proof-of-concept.
You can see here how the errors might be marked in red in the frame of the original, but in green in the corrected window. I intend to give different view options in the release version, including over-under as seen below, side-by-side, or several different options of viewing in a single pane, including superimposed corrections, marginal notes, and a mode to replicate traditional proofreading marks.
