What does jQuery object contain?
<p>let's say, i have this code:</p>

<pre><code>&lt;ul&gt;
  &lt;li&gt;&lt;strong&gt;list&lt;/strong&gt; item 1 -
    one strong tag&lt;/li&gt;
  &lt;li&gt;&lt;strong&gt;list&lt;/strong&gt; item &lt;strong&gt;2&lt;/strong&gt; -
    two &lt;span&gt;strong tags&lt;/span&gt;&lt;/li&gt;
  &lt;li&gt;list item 3&lt;/li&gt;
  &lt;li&gt;list item 4&lt;/li&gt;
  &lt;li&gt;list item 5&lt;/li&gt;
  &lt;li&gt;list item 6&lt;/li&gt;
&lt;/ul&gt;

&lt;script&gt;
    var x = $("li");
    for (var k in x){
        alert(k + x[k]);
    }
&lt;/script&gt;
</code></pre>

<p>The problem is: alert outputs too many things! Why?
Why doesn't it output only li elements?? Where do li elements get stored?? 
How do i output only li elements to which jQuery methods usually applied??</p>
