jaja: Warum braucht das Menü soviele ul:hover?

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Warum braucht das Menü soviele ul:hover?

jaja
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Hallo allerseits!

Eine Fachfrage:

Ich versteh einfach nicht warum dieses Menü soviele dieser ul:hover braucht?

.menu :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul :hover ul :hover ul

danke für eure erklärungen!

Hier die HTML:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml2/DTD/xhtml1-strict.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">  
<head>  
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />  
	<title>CSS Menu Maker</title>  
    <link rel="stylesheet" href="menu_style.css" type="text/css" />  
</head>  
<body>  
  
<div>  
<ul class="menu">  
	<li class="top"><a href="#" class="top_link"><span>Sample Menu</span></a></li>  
  
	<li class="top"><a href="#" class="top_link"><span>Sample Menu This is some longer text</span></a>  
		<ul class="sub">  
			<li><a href="#">Sample Menu This is some longer text</a></li>			  
			<li><a href="#">Sample Menu</a></li>  
            <li><a href="#">Sample Menu</a></li>  
            <li><a href="#">Sample Menu</a></li>  
            <li><a href="#">Sample Menu</a></li>  
  
		</ul>  
	</li>  
	<li class="top"><a href="#" class="top_link"><span>Sample Menu</span></a>  
		<ul class="sub">  
			<li><a href="#">Sample Menu This is some longer text</a></li>			  
            <li><a href="#">Sample Menu</a></li>  
            <li><a href="#">Sample Menu</a></li>  
  
            <li><a href="#">Sample Menu</a></li>  
		</ul>  
	</li>  
	<li class="top"><a href="#" class="top_link"><span>Sample Menu</span></a></li>  
	<li class="top"><a href="#" class="top_link"><span>Sample Menu</span></a></li>  
</ul>  
</div>  
  
</body>  
  
</html>

Hier die CSS:

.bg {background: url(images/button4.gif);}  
.menu {padding:0 0 0 32px; margin:0; list-style:none; height:40px; background:#fff url(images/button1a.gif) repeat-x; position:relative; font-family:arial, verdana, sans-serif; }  
.menu li.top {display:block; float:left; position:relative;}  
.menu li a.top_link {display:block; float:left; height:40px; line-height:33px; color:#bbb; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;}  
.menu li a.top_link span {float:left; font-weight:bold; display:block; padding:0 24px 0 12px; height:40px;}  
.menu li a.top_link span.down {float:left; display:block; padding:0 24px 0 12px; height:40px; background:url(images/down.gif) no-repeat right top;}  
.menu li a.top_link:hover {color:#000; background: url(images/button4.gif) no-repeat;}  
.menu li a.top_link:hover span {background:url(images/button4.gif) no-repeat right top;}  
.menu li a.top_link:hover span.down {background:url(images/button4a.gif) no-repeat right top;}  
  
.menu li:hover > a.top_link {color:#000; background: url(images/button4.gif) no-repeat;}  
.menu li:hover > a.top_link span {background:url(images/button4.gif) no-repeat right top;}  
.menu li:hover > a.top_link span.down {background:url(images/button4a.gif) no-repeat right top;}  
  
.menu table {border-collapse:collapse; width:0; height:0; position:absolute; top:0; left:0;}  
  
.menu a:hover {visibility:visible;}  
.menu li:hover {position:relative; z-index:200;}  
  
.menu ul,  
.menu :hover ul ul,  
.menu :hover ul :hover ul ul,  
.menu :hover ul :hover ul :hover ul ul,  
.menu :hover ul :hover ul :hover ul :hover ul ul {position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}  
  
.menu :hover ul.sub {left:2px; top:40px; right:2px; background: #fff; padding:3px 0; border:1px solid #999999; white-space:nowrap; width:200px; height:auto;}  
.menu :hover ul.sub li {display:block; height:20px; position:relative; float:left; width:250px;}  
.menu :hover ul.sub li a {font-weight:normal;display:block; font-size:15px; height:20px; width:192px; line-height:20px; text-indent:5px; color:#000; text-decoration:none; border:3px solid #fff; border-width:0 0 0 3px;}  
.menu :hover ul.sub li a.fly {background:#fff url(images/arrow.gif) 80px 7px no-repeat;}  
.menu :hover ul.sub li a:hover {background:#999999; color:#fff;}  
.menu :hover ul.sub li a.fly:hover {background:#999999 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;}  
.menu :hover ul li:hover > a.fly {background:#999999 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;}  
  
.menu :hover ul :hover ul,  
.menu :hover ul :hover ul :hover ul,  
.menu :hover ul :hover ul :hover ul :hover ul,  
.menu :hover ul :hover ul :hover ul :hover ul :hover ul  
{left:90px; top:-4px; background: #fff; padding:3px 0; border:1px solid 999999; white-space:nowrap; width:93px; z-index:200; height:auto;}
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