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Section 508 and WCAG 2.1 Compliance

The Kendo UI widgets follow the W3C Web Content Accessibility Guidelines 2.1.

They set the standards for applications for providing accessible content. Depending on the number of guidelines that is followed when building an application, W3C defines three levels of accessibility conformance—A, AA, and AAA levels.

The Kendo UI components also conform to the technical standards set out in Section 508 (Latest Amendment) of the Rehabilitation Act of 1973. They represent the law that requires all Federal Agencies to make their electronic and information technology accessible to people with disabilities. For detailed information on the accessibility features according to the Section 508 Web content standards Kendo UI delivers, refer to the article about Section 508.

Applications built with components that adhere to these guidelines will not only be accessible to people with disabilities, but also to users of all kinds of devices and interfaces such as desktop browsers, voice browsers, mobile phones, automobile-based personal computers, and so on.

The following table lists the Section 508 and WCAG 2.1 compliance levels of support for the Kendo UI widgets.

The described level of compliance in the table below is achievable with the HighContrast Less Theme.

Table 1: 508 and WCAG 2.1 compliance with Kendo UI widgets

Component 508 WCAG 2.1
ActionSheet Yes AAA
AppBar Yes AAA
AutoComplete Yes AA
Avatar Yes AAA
BarCode Yes AAA
BottomNavigation Yes AAA
Breadcrumb Yes AA
Button Yes AA
ButtonGroup Yes AA
Calendar Yes AAA
Captcha Yes AAA
Charts Yes AAA
Chat Yes AAA
CheckBox Yes AAA
CheckBoxGroup Yes AAA
ContextMenu Yes AAA
ComboBox Yes AA
ColorGradient Yes AA
ColorPalette Yes AA
ColorPicker Yes AA
DateInput Yes AAA
DatePicker Yes AAA
DateTimePicker Yes AAA
Diagram Yes AAA
Dialog Yes AA
Drawer Yes AAA
DropDownList Yes AA
DropDownTree* Yes AA
Editor Yes AA
ExpansionPanel Yes AAA
FileManager Yes AAA
Filter Yes AAA
FlatColorPicker Yes AA
FloatingActionButton Yes AAA
Form Yes AAA
Gantt Yes AA
Grid Yes AAA
ImageEditor Yes AA
Loader Yes AАA
LinearGauge Yes AAA
ListBox Yes AAA
ListView Yes AAA
Map Yes AAA
MaskedTextbox Yes AAA
Menu Yes AAA
MultiColumnComboBox Yes AA
MultiSelect Yes AAA
Notification Yes AA
NumericTextbox Yes AAA
OrgChart Yes AAA
Pager Yes AAA
PanelBar Yes AAA
PopOver Yes AAA
QRCode Yes AAA
RadialGauge Yes AAA
RadioButton Yes AAА
RadioGroup Yes AAA
Responsive Panel Yes AA
ScrollView Yes AAA
Scheduler Yes AAA
Slider Yes AAA
Sortable Yes AAA
Splitter Yes AAA
Spreadsheet Yes AA
Stepper Yes AA
Switch Yes AA
TabStrip Yes AAA
TaskBoard Yes AAA
TextArea Yes AAA
TextBox Yes AAA
TileLayout Yes AA
TimeLine Yes A
TimePicker Yes AAA
ToolBar Yes AA
Tooltip Yes AA
TreeList Yes AAA
TreeView Yes AA
Upload Yes AA
Window Yes AAA
Wizard Yes AAA

The DropDownTree widget will be identified as not compliant to the WAI-ARIA spec when tested with static HTML analyzer if there is no selection in the widget and the placeholder configuration is not used. That is because the DropDownTree wrapper element, which has role="listbox" will not contain any option elements. That should be considered a known limitation in the widget. Detailed information on the scenario could be found in this GitHub issue.

Special Considerations

Several Kendo UI widgets feature complex rendering which affects their accessibility standards support provisioned by Section 508.

Messages Support

Widgets, such as the Grid and Calendar, require additional configuration to enable them to successfully pass the Section 508 validation. Due to the fact that they render their content in tables, each table header element has to contain text. To achieve this behavior, use the messages.expandCollapseColumnHeader and messages.weekColumnHeader configuration options.

The following example demonstrates how to specify a text for the expand (collapse) column.

    <div id="grid"></div>
      columns: [
        { field: "name" },
        { field: "age" }
      dataSource: {
        data: [
          { name: "Jane Doe", age: 30, city: "London" },
          { name: "John Doe", age: 33, city: "Berlin" }
      detailInit: function (e) {
        e.detailCell.text("City: " +;
      height: 200,
      messages: {
        expandCollapseColumnHeader: "E/C"

The following example demonstrates how to specify a text for the week column header.

    <div id="calendar"></div>
        "weekNumber": true,
        "messages": {
            "weekColumnHeader": "W"

See Also

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