CSS 定位的规则和常见用法是什么?
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absolute 和 relateive 分别依据什么定位
- relative 依据自身定位
- absolute 依据最近一层的 positive / relative 定位
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>absote relative 定位问题</title> <style type="text/css"> body { margin: 20px; } .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>