CodePen 2.0's new editor is designed to be backward compatible with all existing Classic Pens and Projects. All Projects have already been converted to 2.0 Pens, effectively eliminating the Projects feature. Classic Pens can optionally be converted to 2.0 via a button in the Save menu, though forced migration isn't planned imminently. The engineering goal was to consolidate multiple editors into one while ensuring full feature parity and future extensibility.
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