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Showing content from https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Attributes/aria-selected below:

ARIA: aria-selected attribute - ARIA

The aria-selected attribute indicates the current "selected" state of various widgets.

The aria-selected attribute indicates the current "selected" state for gridcell, option, row and tab roles.

This attribute is used to indicate which elements within single-selection and multiple-selection composite widgets are selected. If more than one element is selectable at a time, include aria-multiselectable="true" on the grid, listbox, tablist, or other owning role, while including aria-selected only on the selectable cells, options, and tabs.

For other roles, the currently selected state is set with aria-current, or possibly aria-checked or aria-pressed, depending on the role.

Widgets that support both aria-selected and aria-current at the same time have different meanings for each. For example, aria-current="page" can be used in a navigation tree to indicate which page is currently displayed, while aria-selected="true" indicates which page will be displayed if the user activates the treeitem.

Setting aria-selected="false" on a focusable gridcell indicates the cell is selectable. If the grid allows more than one gridcell to be selected at a time, set aria-multiselectable="true" on the element with role grid. Setting aria-selected on a column or row header gridcell does not propagate the state to other cells in the column or row.

Both aria-selected and aria-checked are valid for option. Some user interfaces indicate selection with aria-selected in single-select list boxes and with aria-checked in multi-select list boxes.

Don't specify both aria-selected and aria-checked on option elements contained by the same listbox unless the meaning and purpose of aria-selected is different from the meaning and purpose of aria-checked in the user interface, the meaning and purpose of each state apparent, and the UI provides separate methods for controlling each state.

The aria-selected attribute is supported on row but not column. If a grid supports selection, when a cell or row is selected, the selected element has aria-selected="true" set.

If the grid supports column selection and a column is selected, all cells in the column have aria-selected set to true.

In a tablist, aria-selected is used on a tab to indicate the currently-displayed tabpanel.

The selected tab in a tablist should have the attribute aria-selected="true" set. All inactive tabs in the tablist should have aria-selected="false" set. Setting the state only impacts the accessibility tree: make sure to style the active tab in a way that visual indicates it's selected state. The default value for aria-selected on a tab role is false.

If more than one tab is selectable at a time, include aria-multiselectable on the tablist.

In this tablist example, the first tab is selected:

<div class="tab-interface">
  <div role="tablist" aria-label="Sample Tabs">
    <span
      role="tab"
      aria-selected="true"
      aria-controls="panel-1"
      id="tab-1"
      tabindex="0">
      First Tab
    </span>
    <span
      role="tab"
      aria-selected="false"
      aria-controls="panel-2"
      id="tab-2"
      tabindex="-1">
      Second Tab
    </span>
    <span
      role="tab"
      aria-selected="false"
      aria-controls="panel-3"
      id="tab-3"
      tabindex="-1">
      Third Tab
    </span>
  </div>
  <div id="panel-1" role="tabpanel" tabindex="0" aria-labelledby="tab-1">
    <p>Content for the first panel</p>
  </div>
  <div id="panel-2" role="tabpanel" tabindex="0" aria-labelledby="tab-2" hidden>
    <p>Content for the second panel</p>
  </div>
  <div id="panel-3" role="tabpanel" tabindex="0" aria-labelledby="tab-3" hidden>
    <p>Content for the third panel</p>
  </div>
</div>

Note: ARIA only modifies the accessibility tree for an element and how assistive technology presents the content to users. ARIA doesn't change anything about an element's function or behavior.

true

The selectable element is selected.

false

The selectable element is not selected. Implicit default for tab.

undefined (default)

The element is not selectable.

Element.ariaSelected

The ariaSelected property, part of the Element interface, reflects the value of the aria-selected attribute.

ElementInternals.ariaSelected

The ariaSelected property, part of the ElementInternals interface, reflects the value of the aria-selected attribute.

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