[Killswitch]

Also skin it to look like an editor, and then have the user go full screen, because who codes in a browser window?

[JorgeGT]

I manage my blog (uses Jekyll) in Cloud9, one of those web-IDEs with a VPS backend, and it's great. You can get access to your own dev-box from any browser.

[sehr]

I code in default themed chrome if I'm just making a simple webpage! Dev tools has become really capable, but that's hardly programming ;)

[crayak]

Agreed... though you can do a few simple inspector edits that let you change the background and link colors to make it appear the way you want it.