请问VML画图的position:relative和position:absolute有什么区别，谢谢

同浏览器其他对象一样,相对位移和绝对位移,参照下例,感觉不是很特殊,不过POINTS到是应该多注意下
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html xmlns:v="urn:schemas-microsoft-com:vml">
<head>
<title>Thinking in VML</title>
</head>
<STYLE>
 v\:* { BEHAVIOR: url(#default#VML) }
</STYLE>
<body> <v:roundrect strokecolor="black" fillcolor="white" style="position:relative;left:20;top:5;width:100px;height:40px;z-index:9">
<v:shadow on="t" type="single" color="silver" offset="3pt,3pt"></v:shadow>
<v:textbox id="memo" style="font-size:10pt;color:blue;line-height:18px" inset="1,1,1,1">Hello world!<br>Hello VML!</v:textbox>
</v:roundrect>
<v:oval strokecolor="black" fillcolor="white" style="position:absolute;left:9;top:20;width:14px;height:10px;z-index:8">
<v:shadow on="t" type="single" color="silver" offset="3pt,3pt"></v:shadow>
</v:oval>
<v:oval strokecolor="black" fillcolor="white" style="position:relative;left:0;top:35;width:10px;height:8px;Z-index:7">
<v:shadow on="t" type="single" color="silver" offset="3pt,3pt"></v:shadow>
</v:oval>
<!--/v:group--></body>
</html>