[DivMan]

<script>
	  var clickHandler = function () {

		var canvas = document.createElement('canvas');
		canvas.width = 9;
		canvas.height = 9;
		canvas.setAttribute('class', 'canvas')
		document.body.appendChild(canvas)
	    var canvas = document.querySelectorAll("canvas");
	    
	    for(var i = 0; i < canvas.length; i++){
	    	var ctx = canvas[i].getContext("2d");
	      	ctx.lineWidth = 2;
	      	ctx.strokeStyle = "Green";
	      	ctx.beginPath();
	      	ctx.arc(5, 5, 3, 0, Math.PI * 2, false);
	      	ctx.stroke();	
	    }
    
};

document.addEventListener('mouseover', clickHandler)
</script>