<script>
            var $T = Telerik.Web.UI;
            var $Editor = $T.Editor;
            $T.RadEditor.prototype._applyAriaSupport = function () {
                this.get_element().setAttribute("role", "presentation");
                var toolbarContainer = this.get_toolContainer();
                this._applyAriaForLayoutTables();
                var i;
                if (toolbarContainer) {
                    toolbarContainer.setAttribute("role", "toolbar");
                    var toolWrappers = toolbarContainer.getElementsByTagName("ul");
                    for (i = 0; i < toolWrappers.length; i++) {
                        toolWrappers[i].setAttribute("role", "presentation");
                    }
                }
                var modesWrapper = this._getModeButtonsWrapper();
                if (modesWrapper != null) {
                    modesWrapper.setAttribute("role", "presentation");

                    var as = modesWrapper.getElementsByTagName("*");
                    for (i = 0; i < as.length; i++) {
                        var domElement = as[i];
                        var role = domElement.tagName.toLowerCase() == "a" ? "button" : "presentation";
                        domElement.setAttribute("role", role);
                    }
                }

                var hiddenArea = this._contentHiddenTextarea;
                if (hiddenArea) hiddenArea.setAttribute("aria-hidden", "true");
            }
        </script>
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <telerik:RadEditor ID="RadEditor1" runat="server" EnableAriaSupport="true" RenderMode="Mobile"></telerik:RadEditor>