Accessibility view
    
    <!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <title>Excel Basic Add-In</title>
    <!--using JQuery CDN so we do not need to include-->
    <script src="https://code.jquery.com/jquery-1.12.4.min.js" type="text/javascript"></script>
    <script src="https://appsforoffice.microsoft.com/lib/1/hosted/office.js" type="text/javascript"></script>
    <script type="text/javascript">
        (function () {
            "use strict";

            // The initialize function must be run each time a new page is loaded.
            Office.initialize = function (reason) {
                $(document).ready(function () {
                    // Add a click event handler for the button.
                    $('#simple-button').click(function () {
                        Office.context.document.getSelectedDataAsync(Office.CoercionType.Text,
                        function (result) {
                            if (result.status === Office.AsyncResultStatus.Succeeded) {
                                $("#banner-text").text('The selected text is: "' + result.value + '"');
                                $("#banner").show();
                            } else {
                                $("#banner-text").text('Error: ' + result.error.message);
                                $("#banner").show();
                            }
                        });
                    });
                    $("#banner-close").click(function () { $("#banner").hide(); });
                    $("#banner").hide();
                });
            }
        })();
    </script>
</head>
<body>
    <div id="content-main">
        <div class="padding">
            <h1>Basic Addin</h1>
            <div>Select a cell with text and then...</div>
            <button id="simple-button">Click Here!</button>
        </div>
    </div>
    <div id="banner" style="position:absolute;bottom: 0;">
        <div id="banner-text"></div>
        <button id="banner-close"> <i>X</i> </button>
    </div>
</body>
</html>