It looks like back in time nice collaboration has happened between Ace, CodeMirror resulting in common JS Syntax Highlighting Specification:
https://github.com/mozilla/skywriter/wiki/Common-JavaScript-Syntax-Highlighting-Specification

Followed by a blog post:
http://pcwalton.blogspot.com/2010/11/syntax-highlighting-specification.html
Implementation from CodeMirror:
https://github.com/marijnh/CodeMirror/tree/portable
And (almost compliant?) implementation on Ace:
https://github.com/ajaxorg/ace/blob/master/lib/ace/mode/java_highlight_rules.js

Unfortunately since than each editor did it's own thing and modes written for
one still can be consumed by other. Also new and interesting syntax highlighters have appeared http://craig.is/making/rainbows that could have taken advantage of that specification and existing modes but they did not.

Any chances we you could see a renascence ? What about setting up a repository with language modes that both editors could take advantage of ?
Maybe we also could standardizing CSS classnames used so that color schemes can be portable across these projects ?

Also projects like +Eclipse Orion http://www.eclipse.org/orion/ could join this effort.
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