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Velo is a full-stack development platform that empowers you to rapidly build, manage and deploy professional web apps. You edit the code for your site in the code panel, which is displayed at the bottom of the Editor. All the files in the Code Files section can be opened in their own tab. Velo lets you code using standard JavaScript. It also has a specific syntax, or set of rules, for selecting an element on your page which is: #elementName. You can open masterPage.js alongside page code files.