Toggle fullscreen on button click event for IE11. fsMsElm.msRequestFullscreen is always undefined, every fucking time.

waste-of-time.js

var fsButton = document.getElementsByClassName("fullscreen");
for(var i = 0; i < fsButton.length; i++) {
    fsButton[i].addEventListener("click", function() {
        var fullscreenButton = document.getElementsByClassName("fullscreen");
        if (!document.msFullscreenElement) {
            var fsMsElm = document.getElementsByClassName('play-widget-player')[0];
            alert(fsMsElm.msRequestFullscreen);

            if (fsMsElm.msRequestFullscreen) {
                fsMsElm.msRequestFullscreen(); // ie
                fullscreenButton[0].className = "fullscreen minimize";
            } else {
                alert('Fullscreen API is not supported');
            }
        } else {
            if (document.msExitFullscreen) {
                document.msExitFullscreen(); // ie
                fullscreenButton[0].className = "fullscreen";
            }
        }
    });
}