48 Specifiers

A specifier is an object used to keep track of a property whose value should vary according to display context, a window, a frame, or device. The value of many built-in properties, such as the font, foreground, background, and such properties of a face and variables such as modeline-shadow-thickness and top-toolbar-height, is actually a specifier object. The specifier object, in turn, is “instanced” in a particular situation to yield the real value of the property in the current context.

Function: specifierp object

This function returns non-nil if object is a specifier.