Question: This should be pretty simple but I can't make it work. I need the height of an item that is inside the last item with a class. 

HTML like so:

```
    <div class="tag" >
        <div class="left"></div>
        <div class="right"></div>
    </div>
    <div class="tag">
        <div class="left"></div>
        <div class="right"></div>
    </div>
    <div class="tag">
        <div class="left" id="I need this height !"></div>
        <div class="right"></div>
    </div>
<div class="footer"></div>

```

JavaScript poor attempt: 

```
lastLeftHeight = $('.tag').last().$('.left').height();

```

I know that doesn't work. It's just to show what I'm trying to get `.tag` items can vary so I can't target a number or an ID.

Answer: 
try this ..

```
lastLeftHeight=$('.tag:last > .left').height();

```
I would try some combination of using children(), filter(), and last() to get the height of a particular child div. 

<http://www.w3schools.com/jquery/jquery_traversing_filtering.asp>

This explains a little more about traversing up and down the DOM using jQuery, and with examples that I would think would help.