Foundation Don't Close on Esc key if Fullscreen anything is fullscreened

fdtn_close.js

// Don't forget to turn off close_on_esc in your foundation initialization
// $(document).foundation({ reveal: { close_on_esc: false } });

$(document).on('keydown.reveal.custom', dom('reveal'), function(event) {
    var isFullscreen = (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement);
    if (event.keyCode === 27 && !isFullscreen) $(document).foundation('reveal', 'close');
});