Gets the guideline that used for accessibility checking.
Assembly: System.Web (in System.Web.dll)
The property is set when the VerificationAttribute instance is created and is required.
Examples of guidelines include "WCAG 1.1" and "ADA508".
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2