Download the latest version of fancybox on GitHub. Make sure you add the jQuery library before the fancybox JS file; If you already have jQuery fancybox.min.js files; Some functionality (ajax, iframes, etc) will not work when you're opening 12 Feb 2019 View and edit files, create Snippets, debug JavaScript, and set up Workspaces in the Sources panel of Use the Page pane to view all of the resources that the page has loaded. script.src = 'https://code.jquery.com/jquery-3.2.1.min.js'; Open the file via the Snippets pane, and click Run The Run button .