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The following properties may be modified when defining a new page variant for an A/B test or editing an existing one:
Variant display name  | 
The name of the variant displayed in the administration interface.  | 
Variant code name  | 
Sets a code name that serves as an identifier for the page variant. It is also used as the value of the A/B testing cookie stored for visitors assigned to this variant.  | 
Test page  | 
Contains the path of the associated page (document). When users assigned to the variant access the original page of the given A/B test, they will see the page specified here instead. The Select button may be used to easily choose an existing page from the website's content tree.  | 
More resources can be found in Developer's Guide -> Modules -> Website optimization -> A/B testing.