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Version Q2 2011 released 07/12/2011
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Captcha / Accessibility

Accessibility validation

Validate with WAVE

WAVE is a free web accessibility evaluation tool, which checks for compliance issues with many of the Section 508 and WCAG guidelines. Have in mind that only humans can determine whether a web page is accessible - the above validation link is provided for the sake of completeness.


  • The interface of RadCaptcha for ASP.NET AJAX is level A accessible (in compliance with the W3C Web Accessibility Guidelines 2.0) as well as Section 508 compliant.

    RadCaptcha passes the check of the WAVE automated content compliance tool for Section 508 and WCAG 2.0 - Compliance Level A.

    The control is also visible in Windows High Contrast mode.

    Keyboard support: AccessKey with value A is applied to RadCaptcha. Press "Alt + AccessKey" ("Shift + Alt + AccessKey" for Firefox and "Shift + Esc" and then AccessKey for Opera) or use Tab to focus the textbox of the captcha. Press Enter to fire the RadCaptcha validation and submit the page. Note: By default tab-access is disabled in Safari. To enable it, check "Preferences > Advanced > Press tab to highlight each item on a page".

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="vb" AutoEventWireup="true" Inherits="Telerik.Web.Examples.Captcha.Accessibility.DefaultVB"
        CodeFile="DefaultVB.aspx.vb" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <qsf:HeadTag ID="Headtag1" runat="server" />
    </head>
    <body class="BODY">
        <form id="form1" method="post" runat="server">
        <qsf:Header ID="Header1" runat="server" NavigationLanguage="VB" ShowSkinChooser="false" />
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        
        <telerik:RadCaptcha Skin="Office2007" AccessKey="A" ID="RadCaptcha1" runat="server" ErrorMessage="You have entered an invalid code"
            ValidationGroup="SubmitGroup" ForeColor="Red">
        </telerik:RadCaptcha>
        <asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="SubmitGroup" />
        <asp:ValidationSummary ID="ValidationSummary1" ValidationGroup="SubmitGroup" runat="server" />
        <div style="padding-top: 15px;">
            <h3>Accessibility validation</h3>
            <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Validate with WAVE</asp:LinkButton>
            <p>
                WAVE is a free web accessibility evaluation tool, which checks for compliance issues
                with many of the Section 508 and WCAG guidelines. Have in mind that
                only humans can determine whether a web page is accessible - the above validation
                link is provided for the sake of completeness.</p>
        </div>
        <qsf:Footer runat="server" ID="Footer1" ShowCodeViewer="true" />
        </form>
    </body>
    </html>

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