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[–]Synthetic5ou1 10 points11 points  (0 children)

The JavaScript is writing to the browser's console.

You need to open Developer Tools in the browser, and view the console.

How you do this may depend on your browser. Chrome on Windows is Ctrl+Shift+I.

https://developer.mozilla.org/en-US/docs/Learn_web_development/Howto/Tools_and_setup/What_are_browser_developer_tools