Idea: Pass initial code as URL parameter

There are some great uses for the live editor outside of Khan Academy, such as embedding it in an article on a webpage. In this way you can not only quickly and easily showcase a program or code snippet, but allow visitors to change it and interact with it.

Unfortunately, the only way to start off with code already in the editor is to manually create a program on Khan Academy and use its program ID in the source URL. It would be really cool to be able to pass the initial code to some page as an encoded URL parameter, resulting in an embeddable live editor initialized with that code.

I'm thinking something like this:
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Start at the live editor entry point represented by the /computer-programming/pjs/new?code URL and trace how an editor is initialized from its source URL. Define how encoded code should be accepted for an embeddable page, then verify that the supplied example initializes the editor with the requested program and remains editable.

Written by the indexing model from the issue text.