do a barrel roll invoke via spacebar

doabarrelroll.js

(function() {
    var styles = document.createElement("style");
    styles.innerHTML = "@-moz-keyframes roll{100%{-moz-transform:rotate(360deg)}}@-o-keyframes roll{100%{-o-transform:rotate(360deg)}}@-webkit-keyframes roll{100%{-webkit-transform:rotate(360deg)}}.do-a-barrel-roll{-moz-animation-duration:2s;-moz-animation-name:roll;-moz-animation-iteration-count:1;-webkit-animation-duration:2s;-webkit-animation-name:roll;-webkit-animation-iteration-count:1;-o-animation-duration:2s;-o-animation-name:roll;-o-animation-iteration-count:1}";
    document.getElementsByTagName("body")[0].appendChild(styles);

    var interval;
    var keyed = "";

    document.addEventListener("keypress", function(event) {
        if (event.charCode === 32) {
            keyed = "";
            document.body.classList.add("do-a-barrel-roll");
            setTimeout(function() {
                document.body.classList.remove("do-a-barrel-roll");
            }, 2000);
        }

        clearInterval(interval);
        interval = setInterval(function(){
            keyed = "";
        }, 5000);
        
        keyed += String.fromCharCode(event.charCode);
    });
})();