-
What is the hierarchical relationship between standard flow, float, and positioned elements?
standard stream < float < position -
What is the hierarchical relationship between different positioning elements?
Relative, absolute, and fixed default levels are the same -
By default, the positioned box is placed later,
z-index: integer; the larger the value, the higher the display order, the default value of z-index is 0
Note: z-index must be combined with positioning to take effect
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
}
.one {
position: absolute;
left: 20px;
top: 50px;
z-index: 1;
background-color: pink;
}
.two {
position: absolute;
left: 50px;
top: 100px;
background-color: skyblue;
}
/*
默认情况下, 定位的盒子 后来者居上 ,
z-index:整数; 取值越大, 显示顺序越靠上, z-index的默认值是0
注意: z-index必须配合定位才生效
*/
</style>
</head>
<body>
<div class="one">one</div>
<div class="two">two</div>
</body>
</html>
// pink's z-index level is high
