Zurb’s Foundation is an example of a front-end framework. Foundation uses a combination of HTML and CSS to facilitate a 12-column grid system. Using this grid, the layout designer can create rows of page content that will flow neatly and predictably into any modern browsing context. It also offers an array of fully-fledged, but customisable HTML and CSS utilities that work together to create very common website components, like navigation menus and button sets.