我是编码和CSS世界的新手，我对每个div标签与其前身或父母的关系感到困惑。例如，我的代码如下。如果这应该有所作为，那么整个代码的副本就在这个问题的底部。
现在，如果我只是放大查看容器<div id="content">，是否可以安全地假设其子<div id="innercontent">仅受<div id="content">的影响。同样的原则认为<div id="content">受<div id="header">的影响。因此，我的CSS框模型方法将受到前面每个div元素的影响。这是对的吗？
<body>
<div id="wrapper">
<div id="innerwrapper">
<div id="header">
<div id="logo"><img src="images/logo.gif" width="150" height="96" alt="logo" /></div>
<div id="topnav">
<ul>
<li>home</li>
<li>about</li>
<li>browse</li>
<li>faq</li>
<li>contact</li>
</ul>
</div>
</div>
<div id="content">
<div id="innercontent">
Lorem ipsum dolor sit amet, at elementum neque vestibulum sollicitudin semper neque, vitae metus. Nibh ligula mi. Faucibus rutrum elit turpis, nec congue quam ipsum felis neque et, wisi amet, architecto eros congue. Maecenas suspendisse tellus arcu eget pharetra, rhoncus aenean sapien morbi nec arcu, vivamus aliquet lorem amet at, vestibulum purus sociis varius id. Imperdiet id magnis turpis beatae aliquet, vestibulum dolor nec eget eu cras lobortis, vel rerum, risus sed et, libero et non eros commodo. Taciti eu leo sollicitudin malesuada, nibh duis amet aenean, odio aptent ultrices. Tristique morbi nunc ullamcorper ut curabitur. Et a in ut sem varius, sem rutrum vehicula sem sed, at diam amet erat vel. Et sit in ante felis vitae sit.
Quam eget sed elit natoque velit, enim mauris mauris urna, integer amet tellus illo ipsum, dolor fermentum cursus enim mollis tristique porttitor. Non dignissim. Sit ligula leo tincidunt, justo ut ut placerat quisque non, risus nonummy. Ultrices mauris congue aliquam aliquam felis, at placerat, amet vestibulum dictumst pellentesque iaculis risus. Sem sed impedit nullam ultrices lorem aliquam, nulla tellus consequatur in ornare magna. Viverra amet pede in in ornare eu, id arcu. Justo mus suspendisse praesent et, amet mattis convallis ullamcorper felis, fermentum nibh at ac, ullamcorper ipsum auctor et maecenas, aliquam molestiae in qui. Massa elit suspendisse penatibus molestie libero dolor, non leo vitae, sollicitudin a, platea tristique iaculis, tortor augue non est. Ante rutrum quis pellentesque lacinia convallis non, vestibulum nibh nunc luctus nibh a, in amet, iaculis dui ornare pede laoreet eu. Cursus integer vehicula quis, justo eget purus mattis donec vestibulum nunc, nunc vel eros lectus.
</div>
</div>
<div id="rightcol"><img src="http://htmldog.com/r/logo.gif" width="140" height="91" alt="html" /></div>
</div>
<div id="footer">footer</div>
<div>
</body>
完整代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Content-Language" content="en-us" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="author" content="" />
<title>Example</title>
<base href="" />
<link rel="icon" type="image/png" href="" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css" media="all">
* {
margin: 0;
padding: 0;
}
body {
font-family: arial, verdana, sans-serif;
font-size: 0.8em;
}
#wrapper {
/* background-image: url('images/bg-inner-page.gif'); */
background-color: #808080;
height: 200px;
}
#innerwrapper {
width: 960px;
overflow: auto;
}
#header {
}
#logo {
float: left;
margin-top: 20px;
margin-left: 50px;
background-color: gray;
}
#topnav {
float: left;
margin-top: 50px;
margin-left:30px;
color: #ffffff;
}
#topnav ul {
word-spacing: 10px;
}
#topnav ul li {
list-style-type: none;
display: inline;
}
#content {
clear: both;
}
#innercontent {
float: left;
margin-top: 100px;
margin-left: 225px;
margin-bottom: 20px;
width: 400px;
}
#rightcol {
float: left;
margin-top: 125px;
margin-left: 50px;
width: 200px;
}
#footer {
background-color: gray;
}
</style>
</head>
<body>
<div id="wrapper">
<div id="innerwrapper">
<div id="header">
<div id="logo"><img src="images/logo.gif" width="150" height="96" alt="logo" /></div>
<div id="topnav">
<ul>
<li>home</li>
<li>about</li>
<li>browse</li>
<li>faq</li>
<li>contact</li>
</ul>
</div>
</div>
<div id="content">
<div id="innercontent">
Lorem ipsum dolor sit amet, at elementum neque vestibulum sollicitudin semper neque, vitae metus. Nibh ligula mi. Faucibus rutrum elit turpis, nec congue quam ipsum felis neque et, wisi amet, architecto eros congue. Maecenas suspendisse tellus arcu eget pharetra, rhoncus aenean sapien morbi nec arcu, vivamus aliquet lorem amet at, vestibulum purus sociis varius id. Imperdiet id magnis turpis beatae aliquet, vestibulum dolor nec eget eu cras lobortis, vel rerum, risus sed et, libero et non eros commodo. Taciti eu leo sollicitudin malesuada, nibh duis amet aenean, odio aptent ultrices. Tristique morbi nunc ullamcorper ut curabitur. Et a in ut sem varius, sem rutrum vehicula sem sed, at diam amet erat vel. Et sit in ante felis vitae sit.
Quam eget sed elit natoque velit, enim mauris mauris urna, integer amet tellus illo ipsum, dolor fermentum cursus enim mollis tristique porttitor. Non dignissim. Sit ligula leo tincidunt, justo ut ut placerat quisque non, risus nonummy. Ultrices mauris congue aliquam aliquam felis, at placerat, amet vestibulum dictumst pellentesque iaculis risus. Sem sed impedit nullam ultrices lorem aliquam, nulla tellus consequatur in ornare magna. Viverra amet pede in in ornare eu, id arcu. Justo mus suspendisse praesent et, amet mattis convallis ullamcorper felis, fermentum nibh at ac, ullamcorper ipsum auctor et maecenas, aliquam molestiae in qui. Massa elit suspendisse penatibus molestie libero dolor, non leo vitae, sollicitudin a, platea tristique iaculis, tortor augue non est. Ante rutrum quis pellentesque lacinia convallis non, vestibulum nibh nunc luctus nibh a, in amet, iaculis dui ornare pede laoreet eu. Cursus integer vehicula quis, justo eget purus mattis donec vestibulum nunc, nunc vel eros lectus.
</div>
</div>
<div id="rightcol"><img src="http://htmldog.com/r/logo.gif" width="140" height="91" alt="html" /></div>
</div>
<div id="footer">footer</div>
<div>
</body>
</html>
答案 0 :(得分：1)
将HTML结构化为所谓的文档对象模型http://en.wikipedia.org/wiki/Document_Object_Model。
子div仅受其父元素（或任何祖父母进一步向上）的影响。但是，当您开始浮动元素时，如示例所示，您可能会发现其容器外部的元素开始干扰。
在屏幕上，这可能会导致混乱，因为元素相互推动对齐，但是，DOM将始终保持结构化，独立于任何CSS。