In reply to this conservation:
Looking a little project that needs a JS based code editor. Anyone got views on Codemirror vs Ace editor? – Glenn Jones on twitter
@glennjones There's the very basic option of starting using contenteditable on a textarea..? – Dan Eastwell on twitter

@maskingtape Good point, if possible I am going start with contenteditable/textarea and add the editor as progressive enhancement

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@glennjones makes perfect sense. I found Ace very heavy and intensive. Contenteditable syntax highlighting: consider http://prismjs.com/? – Dan Eastwell on twitter