Bookmarklet
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When you're learning Scheme language, you can run the REPL directly on any page that have Scheme tutorial you're learning from. It even work with PDF files and new empty tab (at least in Chrome). Drag this link LIPS REPL to your bookmarks. When you click on the bookmark it will run the interpreter. You can also just click the link.
The bookmark can also be used to add REPL to your LIPS Web application.
It may also not work no sites that are protected with Content Security Policy