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Chris Coyier

Just to address some of the “Cons” in CodePen … =)

> No way to turn off specific code windows

You can’t turn them off, but you can maximize any of the editors ::

> No way to tidy up the code

You can. Just select all the code and press SHIFT + TAB

> No code checker (JSHint)

There is! Press Command-Shift-7 on Mac or Control-Shift-7 on PC

> Not easy to test the code in different versions of a library.

You can link up any JS resource you want though. But the dropdown menu only allows you to link to the latest copy.

> No way to disable the “update as you type coding”

Specifically for JavaScript, you can ::