Or the old fashioned alternative: browser & editor side-by-side on your screen. Browser rendering the same HTML file that is loaded in your editor. Edit. Sav

Or the old fashioned alternative: browser & editor side-by-side on your screen. Browser rendering the same HTML file that is loaded in your editor. Edit. Save. Hit refresh in browser. Optionally: add a simple, development-class web server (like web.py). Bingo, done. I guess I feel like the "editor" and "render" parts of the problem are already solved. I'm not sure that we gain more than we lose by trying to smash them together into one gob. For debugging/tweaking an existing web app, sure (then use something like Firebug), but for general development from scratch there are a lot of benefits to using a real browser and real editor.