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Press Command+Option+J (Mac) or Control+Shift+J (Windows, Linux, Chrome OS) to jump straight into the Console panel of Chrome DevTools. Or, navigate to More Tools > Developer Tools from Chrome menu, and click Console tab. The error console will open. If you don’t see any errors try reloading the page.
4 Answers. With the Chrome Developer Tools window open, click on the “Sources” tab. If you don’t see anything you may need to click on the “Show Navigator” button in the upper-left corner of that tab. With the navigator open, navigate to the file where the cut() function is defined (in your case it’s demo.