Website builder drag and drop front end only: HTML, CSS, Javascript

The project is to create HTML5 Webpage builder with drag & drop easy to use functionality. This is only the front end implementation using CSS, HTML5, bootstrap, Jquery, and Underscore if needed . please look at: [login to view URL] [login to view URL] & [login to view URL] the scope is: + A single page webpage editor + Visual Composer (VC) Page Builder([login to view URL]) with all its front-end functionality without WordPress integration. + Build content Blocks including all bootstrap components & javascript. + Components can be edited based on the component type such as when you add a table, you can edit the table by adding additional columns. + drag and drop elements to the grid and automatically resize element based on grid size. + CSS editor at the page, layer, and components level. + preview content in desktop and mobile mode. not in scope: integration with other products such as CMS backend development Use Case: user will be able to edit layout, add content (form elements, table), edit the content, preview content and finally publish the content. the content publishing is just sending a request to the server to publish. Server processes is out of scope. deliverables: 1. design document 2. prototype 3. Clean HTML, CSS, and Javascript with full documentation. All element should have a commercial friendly licenses such as Apache. Avoid GPL and other licenses that doesn't allow commercial use.