[CiliZ]

var div = document.getElementById('d'),
 		 cmd = +div.dataset.timer;
 
div.innerHTML = cmd;

var timerId = setInterval(function() {
  	console.log(cmd)
  	div.innerHTML = cmd;
  	cmd--
    
    if(cmd < 0){
    	window.clearInterval(timerId);
    }
 
}, 1000);