[j0hnik]

<div style="position:relative">111</div>
	<script>
var div = document.querySelector('div');
(run=()=>{
	var l = parseFloat(getComputedStyle(div).left),
	t = parseFloat(getComputedStyle(div).top);
	if(l<200 && t==0) div.style.left = l+1+'px';
	if(l==200 && t<200) div.style.top = t+1+'px';
	if(l>0 && t==200) div.style.left = l-1+'px';
	if(l==0 && t>0) div.style.top = t-1+'px';
	setTimeout(run,4);
})();

	</script>