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Accessibility in ASP.NET Core Tabs control

26 Oct 2021 / 3 minutes to read

ARIA attributes

Tab component is designed by considering WAI-ARIA standard. Tab is supported with ARIA Accessibility which is accessible by on-screen readers, and other assistive technology devices. The following list of attributes are added in the Tab.

Roles and Attributes Functionalities
tablist This is set to role attribute in the Tab element that describes actual role of the element.
tabpanel This is set to role attribute for the Tab content that describes the role for viewing the active content.
presentation This is set to role attribute for nested elements in the Tab.
aria-orientation It indicates the Tab header orientation. Default value of this attribute is horizontal.
aria-activedescendant It indicates the current active child of the Tab component.
aria-haspopup It indicates the popup mode in the Tab. The default value of this attribute is false. If popup mode is enabled, the attribute value is set to true.
aria-disabled It indicates the disabled state of the Tab.
aria-selected It indicates the selection state for Tab items. Active Tab is set to true for this attribute.
aria-hidden It indicates the hidden element of the Tab.
aria-controls It indicates the associated Tabpanel for the header.
aria-labelledby It indicates the associated Tab header for the content.

Keyboard interaction

By default, keyboard navigation is enabled. This component implements keyboard navigation support by following the WAI-ARIA practices. Once focused on the active Tab element, you can use the following key combination for interacting with the Tab.

Key Description
Left Moves focus to the previous Tab. If focus is on the first Tab, the focus will not move to any Tab.
Right Moves focus to the next Tab. If focus is on the last Tab element, the focus will not move to any Tab.
Enter or Space Selects the Tab if it is not selected. Opens the popup dropdown icon if it is focussed. Select the Tab item as active when popup item is focussed.
Esc(Escape) Closes the popup if popup is in opened state.
Down or Up When the popup is open and focused, it will move to previous/next Tab items of the popup in the vertical direction.
Home Moves focus to the first Tab.
End Moves focus to the last Tab.
Shift + F10 If popup mode is enabled, it opens the popup when the Tab is focused.
Delete Deletes the Tab, if close button is enabled in Tab header.
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@using Syncfusion.EJ2.Navigations;

    var content0 = "HyperText Markup Language, commonly referred to as HTML, is the standard markup language used to create web " +
            "pages. Along with CSS, and JavaScript, HTML is a cornerstone technology, used by most websites to create visually " +
            "engaging web pages, user interfaces for web applications, and user interfaces for many mobile applications.[1] Web " +
            "browsers can read HTML files and render them into visible or audible web pages. HTML describes the structure of a " +
            "website semantically along with cues for presentation, making it a markup language, rather than a programming language.";

    var content1 = "C# is intended to be a simple, modern, general-purpose, object-oriented programming language. Its development " +
            "team is led by Anders Hejlsberg. The most recent version is C# 5.0, which was released on August 15, 2012.";

    var content2 = "Java is a set of computer software and specifications developed by Sun Microsystems, later acquired by Oracle " +
            "Corporation, that provides a system for developing application software and deploying it in a cross-platform computing " +
            "environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to " +
            "enterprise servers and supercomputers. While less common, Java applets run in secure, sandboxed environments to " +
            "provide many features of native applications and can be embedded in HTML pages.";

    var content3 = "The command-line compiler, VBC.EXE, is installed as part of the freeware .NET Framework SDK. Mono also " +
            "includes a command-line VB.NET compiler. The most recent version is VB 2012, which was released on August 15, 2012.";

    var content4 = "Xamarin is a San Francisco, California based software company created in May 2011[3] by the engineers that " +
            "created Mono,[4] Mono for Android and MonoTouch that are cross-platform implementations of the Common Language " +
            "Infrastructure (CLI) and Common Language Specifications (often called Microsoft .NET). With a C#-shared codebase, " +
            "developers can use Xamarin tools to write native Android, iOS, and Windows apps with native user interfaces and share " +
            "code across multiple platforms.[5] Xamarin has over 1 million developers in more than 120 countries around the World " +
            "as of May 2015.";

    var content5 = "ASP.NET is an open-source server-side web application framework designed for web development to produce " +
            "dynamic web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications " +
            "and web services. It was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor " +
            "to Microsoft Active Server Pages (ASP) technology. ASP.NET is built on the Common Language Runtime (CLR), allowing " +
            "programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension framework allows " +
            "ASP.NET components to process SOAP messages.";

    var content6 = "The ASP.NET MVC is a web application framework developed by Microsoft, which implements the " +
            "model–view–controller (MVC) pattern. It is open-source software, apart from the ASP.NET Web Forms component which is " +
            "proprietary. In the later versions of ASP.NET, ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages (a platform using " +
            "only Razor pages) will merge into a unified MVC 6.The project is called ASP.NET vNext.";

    var content7 = "JavaScript (JS) is an interpreted computer programming language. It was originally implemented as part of " +
            "web browsers so that client-side scripts could interact with the user, control the browser, communicate " +
            "asynchronously, and alter the document content that was displayed.[5] More recently, however, it has become common in " +
            "both game development and the creation of desktop applications.";

<ejs-tab id="ej2Tab" heightAdjustMode="Auto" overflowMode="Popup">
        <e-tab-tabitem header="ViewBag.headerText0" content="@content0"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText1" content="@content1"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText2" content="@content2"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText3" content="@content3"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText4" content="@content4"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText5" content="@content5"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText6" content="@content6"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText7" content="@content7"></e-tab-tabitem>

    #container {
        visibility: hidden;
        max-width: 650px;

    #loader {
        color: #008cff;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;

    .e-content .e-item {
        font-size: 12px;
        margin: 10px;
        text-align: justify;
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public ActionResult Index()
    ViewBag.headerText0 = new TabHeader { Text = "HTML" };
    ViewBag.headerText1 = new TabHeader { Text = "C Sharp(C#)" };
    ViewBag.headerText2 = new TabHeader { Text = "Java" };
    ViewBag.headerText3 = new TabHeader { Text = "VB.Net" };
    ViewBag.headerText4 = new TabHeader { Text = "Xamarin" };
    ViewBag.headerText5 = new TabHeader { Text = "ASP.NET" };
    ViewBag.headerText6 = new TabHeader { Text = "ASP.NET MVC" };
    ViewBag.headerText7 = new TabHeader { Text = "JavaScript" };
    return View();