Idle timeout warning modal working on screen reader
<p>I need help with a modal that fires when user is idle.  It works great until I test on Firefox with NVDA running.  There are issues with focus when using the arrow keys and when I swipe on a mobile.  When the modal appears and the user uses arrow or swipes the focus will bounce from the yes button to the header after a few seconds if I wait to click it.  I have loaded the working example to: <a href="https://jsfiddle.net/ncanqaam/">https://jsfiddle.net/ncanqaam/</a></p>

<p>I changed the idle time period to one minute and removed a portion which calls the server to extend the user's session. </p>

<pre><code>var state ="L";
var timeoutPeriod = 540000;
var oneMinute = 60000;
var sevenMinutes = 60000;

var lastActivity = new Date();

function getIdleTime() {
    return new Date().getTime() - lastActivity.getTime();
}

//Add Movement Detection
function addMovementListener() {
    $(document).on('mousemove',  onMovementHandler);
    $(document).on('keypress',  onMovementHandler);
    $(document).on('touchstart touchend',  onMovementHandler);
}
//Remove Movement Detection
function removeMovementListener() {
    $(document).off('mousemove', onMovementHandler);
    $(document).off('keypress',  onMovementHandler);
    $(document).off('touchstart touchend',  onMovementHandler);
}

//Create Movement Handler
function onMovementHandler(ev) {
    lastActivity = new Date();
    console.log("Something moved, idle time = " + lastActivity.getTime());
}

function hide() {
    $('#overlayTY').removeClass('opened'); // remove the overlay in order to  make the main screen available again
    $('#overlayTY, #modal-session-timeout').css('display', 'none'); // hide the modal window
    $('#modal-session-timeout').attr('aria-hidden', 'true'); // mark the modal window as hidden
    $('#modal-session-timeout').removeAttr('aria-hidden'); // mark the main page as visible
}

if (state == "L") {
    $(document).ready(function() {
        //Call Event Listerner to for movement detection
        addMovementListener();
        setInterval(checkIdleTime, 5000);
    });

    function endSession() {
        console.log('Goodbye!');
    }

    var modalActive = false;
    function checkIdleTime() {
        var idleTime = getIdleTime();
        console.log("The total idle time is " + idleTime / oneMinute + " minutes.");

        if (idleTime &gt; sevenMinutes) {
            var prevFocus = $(document.activeElement);
            console.log('previously: ' + prevFocus);
            var modal = new window.AccessibleModal({
                mainPage: $('#oc-container'),
                overlay: $('#overlayTY').css('display', 'block'),
                modal: $('#modal-session-timeout')
            });

            if (modalActive === false) {
                console.log(modalActive);
                $('#modal-session-timeout').insertBefore('#oc-container');
                $('#overlayTY').insertBefore('#modal-session-timeout');
                modal.show();
                $('#modal-overlay').removeClass('opened');
                modalActive = true;
                console.log(modalActive);
                console.log('the modal is active');
                $('.js-timeout-refresh').on('click touchstart touchend', function(){
                    hide();
                    modalActive = false;
                    prevFocus.focus();
                    addMovementListener();
                    lastActivity = new Date();
                });

                $('.js-timeout-session-end').on('click touchstart touchend', function(){
                    hide();
                    $('#overlayTY').css('display', 'none');
                    endSession();
                });
            }   
        }
        if ($('#overlayTY').css('display') === 'block'){
            removeMovementListener();
        }

        if (idleTime &gt; timeoutPeriod) {
            endSession();
        }
    }
}
</code></pre>