绝对定位是相对定位元素的什么边界进行定位的?
绝对行为元素是以相对定位元素的border内边缘为基准进行定位的。
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>绝对定位</title> <style> body { height: 2000px; margin: 0px; } .relativeBox { width: 400px; height: 300px; background: purple; padding: 20px; border: 20px solid blue; margin: 50px auto; position: relative; } .absoluteBox { width: 100px; height: 100px; background: #ccc; position: absolute; top:0; left:0; } .son{ width:50%; height:50%; margin:0 auto; background-color:yellow; } </style> </head> <body> <div class='relativeBox'> <div class='son'> <div class='absoluteBox'> </div> </div> </div> </body> </html>