Also see http://bluepeneditor.com/

Better just to edit across multiple browser tags, use back buttons to keep reediting, and refresh.

It sounds a bit clunky, but a really complex UI is not going to work very well, and while that may be slick, bugginess (much of it unavoidable, due to lack of clearly defined semantics, or buried network errors) is much worse.

When this was written (the ideas are based on considerations we had much before 2011), the view of how the web would evolve is a bit different from reality. UIs have got simpler and less busy, not really complex like old desktop UIs; browsers have got better.

With modern browsers, back buttons and tabs work much better than they used to. Composr's standard UI is nicer than it was too.