comma syntax javascript
<p>Can someone help me understand what the next line means? What is - </p>

<pre><code>elem,.style.height = ( pos /100) * h + "px";
</code></pre>

<p>There's a comma right after elem.</p>

<pre><code>function slideDown( elem ){
 // 
 elem.style.height = '0px';
 show(elem);

 var h = fullHeight(elem);

 for (var i = 0 ; i &lt;= 100; i+= 5){
  (function(){
   var pos = i; 

   setTimeout(function(){
    elem,.style.height = ( pos /100) * h + "px";
   }, (pos + 1) * 10 );
  })();
 }
}
</code></pre>
