The MIT licensed code editor has the ability to be embedded into any JavaScript enabled webpage. You have probably already seen it at work in popular applications such as Adobe’s Brackets editor, CoDev, Light Table and many other online playgrounds for SQL, Haxe, JavaScript and WebGL. CodeMirror 3.0 is the end result of over four months of work by its creators with several updates and incompatibilities such as no more support for IE7. The new editor also includes several widgets which can be placed between lines or replace arbitrary pieces of content providing a much richer editing functionality. Read all the details here.