A content completion assistant like the one available for XML documents offers the CSS properties and the values available for each property. It is activated on the (CTRL - Space) shortcut and it is context-sensitive when invoked for the value of a property.
Content Completion in CSS Stylesheets
The properties and the values offered as proposals are dependent on the CSS Profile selected in the page, Profile combo box. The CSS 2.1 set of properties and property values is used for most of the profiles, excepting CSS 1 and CSS 3. For these two, specific proposal sets are used.
<?xml version="1.0" encoding="UTF-8"?> <css_keywords> <property name="custom"> <summary>Description for custom property.</summary> <value name="customValue1"/> <value name="customValue2"/> </property> </css_keywords>