[WSG] first-child selector not always work?

[tee]

I have this
#best_seller {width 200px;background: #369}
#best_seller ul {background: #000}
#best_seller ul:first-child {background: #ddd}
If I add an adjacent selector

#best_seller ul+ul {background: red}

<div id="best_seller">
	<ul>.....</ul> /* this one should show background #ddd  but  it  
doesn't*/
        <ul>.....</ul> /* adjacent works! Red background show up) */
        <ul>.....</ul>  /* this one shows black background and is correct. */
</div>

according to w3c css2 spec, 5.11.1 :first-child pseudo-class:
The :first-child pseudo-class matches an element that is the first  
child of some other element.

tee


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