Accessibility in ASP.NET Core Tab control

@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-tabitems>
        <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>
    </e-tab-tabitems>
</ejs-tab>

<style>
    #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;
    }
</style>

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();
}