Online sandbox with tabs and files

To publish examples and tasks in the English version of javascript.ru, a sandbox was needed a little more powerful than jsfiddle / jsbin.

I wrote and posted a beta on javascript.info/play/rus (the site itself is still half closed there).

Additional features include:

• Files
• Tabs
• Hotkeys (for now except Opera)
• Export to zip
• Saving with the ability to scroll through previous revisions

It was conceived for a simple purpose - the publication of examples, tasks, solutions in a convenient form for viewing online and editing. I would be glad if amiss on something else.
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PS By the way, in Kharkov in a week javascript master classes - javascript.ru/mk . Join if there will be interest :).