The screenshot shows the controls in the Properties window for ADF skins.
Blue icon indicates the Background Color property for the af:button component inherits its value
Green icon indicates the property has been modified
Properties prefaced by —tr- are ADF skin properties, not CSS properties.
Dropdown list displays a list of predefined values.
The Gear icon appears when you move your mouse over the areas beside the property fields. Click the icon to display menus that allow you to edit properties or go to a location where a property value is defined (Go to Declaration)