[рони]

cript,

<textarea id="log" ></textarea>
<script>
	var n = 0, el = document.querySelector('#log');
	function log()
	{
	  el.value += ++n + 'running..\n';
	  el.scrollTop += 30;
	  el.focus();
	  setTimeout(log, 1000);
	}
	log()
</script>