absolute和relative分别依据什么定位?
body
定位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>Documenttitle>
<style>
.relative{
position: relative;
width: 400px;
height: 200px;
border: 1px solid #ccc;
top: 20px;
left: 50px;
}
.absolute{
position: absolute;
width: 200px;
height: 100px;
border: 1px solid blue;
top: 20px;
left: 50px;
}
style>
head>
<body>
<p>absolute 和 relative 定位问题p>
<div class="relative">
<div class="absolute">
this is absolute
div>
div>
body>
html>
效果