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ANSWER
window.toggleFullscreen = function() {
var btn = document.getElementById('fs-btn');
var doc = document.documentElement;
if (!document.fullscreenElement && !document.webkitFullscreenElement) {
// ENTER
if (doc.requestFullscreen) {
doc.requestFullscreen();
} else if (doc.webkitRequestFullscreen) {
doc.webkitRequestFullscreen();
}
if(btn) {
btn.innerText = "EXIT";
btn.style.background = "#e74c3c";
}
} else {
// EXIT
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
if(btn) {
btn.innerText = "FULLSCREEN";
btn.style.background = "#444";
}
}
};
