<!DOCTYPE html><html><head><meta charset="UTF-8"><title>仿豆瓣</title><link rel="stylesheet" href="css/css.css"><style>*{margin:0px;padding:0px;}a{text-decoration: none;}li{list-style-type:none;}img,input{ border:none; border:1px solid none;}#head{ width:1152px; height:88px; border:solid 1px red; margin:0px auto; position:relative;}}#head .head-search{ width:272px;height:32px; border:1px solid #c3c3c3; position:absolute; left:195px;top:30px; color:#e4e4e4;}#head .ico{ background: url(../images/icon.png) no-repeat; display:block; width:14px; height:13px; position:absolute; top:41px; left:434px;}</style></head><body> <div id = "head"> <a class="head-logo" href="#"></a> <form > <input type="text" class ="head-search" placeholder="书籍，电影，音乐，小组，小站，成员"/ > <a class="ico" href="#"></a> </form></div></body></html><a class="ico>标签设定了absolute属性，为什么没有依据他的父元素<form>来定位？而是根据了最外层的<div id="head">这个块元素来定位
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