When we design the page, we will encounter the child Div to control the inside of the parent div fixed position, but also the layer up and down relationship. Here's a little trick.
The position of the parent Div uses the relative, the position of the child Div uses absolute, and then locates with left and top.
If the position of the child Div uses the fixed, you cannot use left, then change to Margin-left.
This is not clear, just a record.
Code:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 transitional//en" >
<title>Untitled</title>
<body>
<div style= "width:500px; height:1300px; Background: #0f0; margin:0 Auto; position:relative; " >
<div style= "width:300px; height:30px; Background: #f00; position:fixed; _position:absolute; top:30px; margin-left:50px; z-index:100; " >test!!!! </div>
Hello world!
<div>
</body>
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