Setting this property at the page-level establishes a Page-level default that overrides any setting made at the application configuration level (i.e., in the "web.config" file) through the styleSetPath attribute.
The style set path specified by this property can still be overridden at the control-level.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2