The visual indication of the collapsed state is synchronized by a CSS attribute selector.Indicates the parent node is closed, i.e., the descendant elements are not visible.Applied only to treeitem elements that are parent nodes, i.e., they contain a ul with the group role.When the user moves focus in the tree, the element included in the tab sequence changes to the element with focus as described in In this implementation, the first treeitem in the tree is included in the tab sequence when the page loads. Only one treeitem in the tree has tabindex="0".Includes the treeitem element in the tab sequence.All treeitem elements are focusable, but only one is included in the tab sequence.Makes the treeitem element focusable without including it in the tab sequence of the page.Refers to the heading element that contains the label that identifies the purpose of the tree. Managing Focus Within Components Using a Roving tabindex. The tree element is not focusable because it implements the practice described in Identifies the ul element as a tree widget.Role, Property, State, and Tabindex Attributes Expands all closed sibling nodes that are at the same level as the focused node.Search ignores nodes that are descendants of closed nodes.
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