2008/12/4 Gregory Maxwell gmaxwell@gmail.com:
This type of edit box mediation has been done by other edit-helper userscripts, so it's certainly possible.
Thoughts?
While there are some theoretical risks (people making text changes without taking all the markup into account) I don't believe they would present a major problem. Colour choice may be an issue with the current red/green colorblindness prevalence. I'm also not sure how a screen reader would view it but that can be dealt with.
Your other problem is the potential amount of javascript required and the effect that will have on older computers.