@progress/wct-a11y-spec
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Contains accessibility and keyboard navigation specification of Telerik and Kendo web components.
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Markdown
Out of the box, the Telerik UI for Blazor TreeList provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.
The TreeList is compliant with the [Web Content Accessibility Guidelines (WCAG) 2.2 AA](https://www.w3.org/TR/WCAG22/) standards and [Section 508](https://www.section508.gov/) requirements, follows the [Web Accessibility Initiative - Accessible Rich Internet Applications (WAI-ARIA)](https://www.w3.org/WAI/ARIA/apg/) best practices for implementing the [keyboard navigation](#keyboard-navigation) for its `component` role, provides options for managing its focus and is tested against the most popular screen readers.
## WAI-ARIA
This section lists the selectors, attributes, and behavior patterns supported by the component and its composite elements, if any.
The TreeList is a composite component that consists of 2 logically separated structural elements:
- Toolbar (`role=toolbar`);
- Tree Grid (`role=treegrid`);
### TreeList Toolbar
TreeList Toolbar follows the specification of the ToolBar component.
[ToolBar accessibility specification]({{toolbar_a11y_link}})
| Selector | Attribute | Usage |
| -------- | --------- | ----- |
| `.k-grid-toolbar` | `role=toolbar` | The toolbar is a collection of command buttons and inputs. |
| | `aria-label` | Clarifies the purpose of the toolbar. |
| | `aria-controls=.k-grid-aria-root id` | Pointing to the id of the element with `role=treegrid`. |
### Tree Grid
The element with `role=treegrid` must not include the ToolBar element as it does not belong to the `role=treegrid` element itself. It implements the ARIA specification for the Grid component with some exceptions listed below.
[Grid accessibility specification]({{grid_a11y_link}})
The below table lists the ARIA requirements for the TreeList which are not present in the Grid specification:
| Selector | Attribute | Usage |
| -------- | --------- | ----- |
| `.k-treelist .k-grid-aria-root` | `role=treegrid` | Sets the proper role for the TreeList component. |
| `.k-table-tbody .k-table-row` | `aria-expanded=true/false` | Set on the currently expanded row(s). |
| `.k-table-tbody .k-i-caret-alt-down,.k-table-tbody .k-i-caret-alt-right,.k-table-tbody .k-svg-i-caret-alt-down,.k-table-tbody .k-svg-i-caret-alt-right` | `aria-hidden=true` | Removes the expand/collapse icon from the accessibility tree. |
## Resources
[WAI-ARIA specification for tree grid](https://www.w3.org/TR/wai-aria-1.2/#treegrid)
## Section 508
The TreeList is fully compliant with the [Section 508 requirements](http://www.section508.gov/).
## Testing
The TreeList has been extensively tested automatically with [axe-core](https://github.com/dequelabs/axe-core) and manually with the most popular screen readers.
> To report any accessibility issues, contact the team through the [Telerik Support System](https://www.telerik.com/account/support-center).
### Screen Readers
The TreeList has been tested with the following screen readers and browsers combinations:
| Environment | Tool |
| ----------- | ---- |
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |