[KOLANICH]

function getDpMM(){
	var d=document.createElement("DIV");
	d.style.width=d.style.height="1mm";
	d.style.display="table-cell";
        document.body.appendChild(d);
	var r=d.getBoundingClientRect();
	return {"h":r.width,v:r.height};
        document.body.removeChild(d);
}
alert(JSON.stringify(getDpMM()));