Make all html elements randomly blink, lol

var leafs = (function getLeafNodes(master) {
    var nodes = Array.prototype.slice.call(master.getElementsByTagName("*"), 0);
    var leafNodes = nodes.filter(function(elem) {
        return !elem.hasChildNodes() || elem.innerText!="";
    });
    return leafNodes;
})(document);

for(var i=0; i<leafs.length; i++) {
    var el = leafs[i];
    el.funOn = (Math.random()+0.1)*2;
    el.funOff = (Math.random()+0.1)*2;
    el.funT = 0;
    el.funState = el.style.visibility==="hidden"?"disabled":true;
}
var td = 100;
function doFun() {
    for(var i=0; i<leafs.length; i++) {
        var el = leafs[i];
        el.funT+=td/1000;
        if(el.funT>=el.funOn && el.funState===true) {
            el.funT = 0;
            el.funState=false;
            el.style.visibility="hidden";
        }
        else if(el.funT>=el.funOff && el.funState===false) {
            el.funT = 0;
            el.funState=true;
            el.style.visibility="visible";
        }
    }
    setTimeout(doFun, td);
}
setTimeout(doFun, td);