An option item of a tree. This is an element within a tree that may be expanded or collapsed if it contains a sub-level group of tree item elements.
Description

An option item of a tree. This is an element within a tree that may be expanded or collapsed if it contains a sub-level group of tree item elements.

A collection of treeitem elements to be expanded and collapsed are enclosed in an element with the group role.

Authors MUST ensure elements with role treeitem are contained in, or owned by, an element with the role group or tree.

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