description of field for editing style classes in the Property Inspector

This screenshot displays the Property Inspector in the Page Designer when a Heading component is selected on the canvas. The General Attributes category in the All tab of the Property Inspector contains a list of properties that can be edited. The class field displays a list of the classes applied to the selected element, separated by spaces. This screenshot shows that the field contains four classes. Three of the classes are the default classes applied to the component. The fourth class is a custom class that has been added.