一张图更好的帮助你理解css中的一些概念

測試代碼

dhtmlpos
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>dhtmlpos</title>
</head>
<body style="border-right: #99ccff 20px solid; border-top: #99ccff 20px solid; border-left: #99ccff 20px solid; border-bottom: #99ccff 20px solid; left: 100px; position: relative; top: 100px; padding-right: 17px; padding-left: 17px; padding-bottom: 17px; margin: 17px; padding-top: 17px;" bgcolor="#66cc00">
出现在什么地方啊。运行之后，如果你打开了qq程序，那么就可以同时按下ctrl+alt+a来操作。
<div style="border-right: #99ccff 10px solid; border-top: #99ccff 10px solid; border-left: #99ccff 10x solid; border-bottom: #99ccff 10px solid; left: 0px; width: 150px; position: relative; top: 50px; height: 200px; background-color: #ffcc00; padding-left: 10px; padding-right: 10px; padding-bottom: 10px; margin: 5px; padding-top: 10px;">
<textarea  contenteditable=inherit>DTHML is so
cool!DTHML is socool!DTHML is socool!DTHML is socool!DTHML is socool!DTHML is socool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!DTHML is so
cool!</textarea></div>
</body>
<SCRIPT LANGUAGE="JavaScript">
var div=document.getElementsByTagName("div")[0];
var s = "";
s += "\r\ndiv.style.left："+ div.style.left;
s += "\r\ndiv.style.top："+ div.style.top;
s += "\r\ndiv.style.border："+ div.style.border;
s += "\r\ndiv.style.margin："+ div.style.margin;
s += "\r\ndiv.style.padding："+ div.style.padding;
s += "\r\ndiv.offsetLeft："+ div.offsetLeft;
s += "\r\ndiv.offsetHeight："+ div.offsetHeight;
s += "\r\ndiv.offsetTop："+ div.offsetTop;
s += "\r\ndiv.offsetWidth："+ div.offsetWidth;
s += "\r\ndiv.clientLeft："+ div.clientLeft;
s += "\r\ndiv.clientHeight："+ div.clientHeight;
s += "\r\ndiv.clientWidth："+ div.clientWidth;
s += "\r\ndiv.clientTop："+ div.clientTop;
s += "\r\ndiv.scrollTop："+ div.scrollTop;
s += "\r\ndiv.scrollHeight："+ div.scrollHeight;
s += "\r\ndiv.scrollWidth："+ div.scrollWidth;
var body1=document.getElementsByTagName("body")[0];
s += "\r\nbody1.style.left："+ body1.style.left;
s += "\r\nbody1.style.top："+ body1.style.top;
s += "\r\nbody1.style.border："+ body1.style.border;
s += "\r\nbody1.style.margin："+ body1.style.margin;
s += "\r\nbody1.style.padding："+ body1.style.padding;
s += "\r\ndocument.body.clientWidth："+ document.body.clientWidth;
s += "\r\ndocument.body.clientLeft："+ document.body.clientLeft;
s += "\r\ndocument.body.clientHeight："+ document.body.clientHeight;
s += "\r\ndocument.body.clientTop："+ document.body.clientTop;
s += "\r\ndocument.body.offsetWidth："+ document.body.offsetWidth;
s += "\r\ndocument.body.offsetHeight："+ document.body.offsetHeight;
s += "\r\ndocument.body.offsetLeft："+ document.body.offsetLeft;
s += "\r\ndocument.body.offsetTop："+ document.body.offsetTop;
s += "\r\ndocument.body.scrollWidth："+ document.body.scrollWidth;
s += "\r\ndocument.body.scrollHeight："+ document.body.scrollHeight;
s += "\r\ndocument.body.scrollTop："+ document.body.scrollTop;
s += "\r\ndocument.body.scrollLeft："+ document.body.scrollLeft;
s += "\r\n网页正文部分上："+ window.screenTop;
s += "\r\n网页正文部分左："+ window.screenLeft;
s += "\r\n屏幕分辨率的高："+ window.screen.height;
s += "\r\n屏幕分辨率的宽："+ window.screen.width;
s += "\r\n屏幕可用工作区高度："+ window.screen.availHeight;
s += "\r\n屏幕可用工作区宽度："+ window.screen.availWidth;
alert(s);
</SCRIPT>
</html>