When working with CSS, JS, tracking pixels and the like, it's easy to make a change and break something. If you don't take note of the line where you added the code, your page could be permanently broken. It would be great if the Design Studio had version control where you could look at two versions of your code and have the differences highlighted for you. I know it wouldn't be easy, but it would eliminate a huge pain point for everyone coding in the Design Studio
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