Only one owner

Definition	Widgets must be owned by only one parent widget.
Purpose	ARIA roles, properties and states describes the features of interactive widgets to users of assistive technologies, especially screen reader users.
Mappings	HTML4 Legacy Techniques (Required) HTML5 and ARIA Techniques (Required)
WCAG 2.0 Success Criteria	4.1.2 Name, Role, Value (Level A, Primary Success Criterion) Other Related Success Criterion: 1.3.1 Info and Relationships (Level A) 3.3.2 Labels or Instructions (Level A)
Rule Category	Widgets/Scripting
Scope	Element
Target Resources	Widgets with required parent roles `[aria-owns]`
Techniques	Parent widget roles with aria-owns must accurately describe the parent relationships, a child widget can only have one parent widget.
Informational Links	Accessible Rich Internet Applications (WAI-ARIA) 1.0 Specification: Widget Roles G108: Using markup features to expose the name and role, allow user-settable properties to be directly set, and provide notification of changes OAA Web Accessibility ARIA Examples