Does anyone know of a project that will allow the editing of a language (any language) within a web-page itself (via HTML-5) with content assist (ctrl+space)?
CLARIFICATION
I'm not looking for a HTML5 editor (I'm aware of many), I'm looking for a language editor written in HTML5/Javascript that runs within a browser.
Bespin is an experimental web-based IDE written by the Mozilla team which can be used to edit HTML and JS (and presumably any other kind of) files.