批改状态:合格
老师批语:还行!多注意一下页面排版!



<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>浮动元素的塌陷和解决方案</title><style>.container{border:3px dashed blue;background-color: lightseagreen;}.item{width: 150px;height: 150px;}.item:first-of-type{background-color:lightpink ;}.item:last-of-type{background-color:lightsalmon;}.item:nth-of-type(2){background-color:lightgreen ;}/* 当三个子元素全部浮动之后,容器container没有子元素的支持,高度塌陷, */.item{float:left;}/* 塌陷解决方案 *//* 解决方案1. 添加一个伪元素解决-可以用,但啰嗦*//* .container::after{content: "";display: block;clear:both;} *//* overflow:最简单的解决方案*/.container{/* overflow: hidden=overflow: auto; *//* overflow: hidden; */overflow: auto;}</style></head><body><div class="container"><div class="item">浮动元素1</div><div class="item">浮动元素2</div><div class="item">浮动元素3</div><!-- <div class="clear"></div> --></div></body></html>

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>中国诗词大会:绝对定位完成三列布局</title><style>/* 初始化 */* {margin:0;padding:0;box-sizing: border-box;color:red;font-size: 1.2rem;}/* 页眉样式 与内容 */.header{width: 1060px;height: 500px;margin:auto;background:url('header.png') no-repeat center;}/* 页脚样式 与内容*/.footer{width: 1060px;height: 130px;margin:auto;background:lightgreen url('footer.png') no-repeat center ;}/* 主体样式 */.container{width: 1060px;margin: 10px auto;background-color: #ccc;min-height:200px;/* 转为定位元素,作为定位父级*/position: relative;}.container>.left{width:85px;min-height: 200px;background-color: wheat;background-image:url('left.png') ;background-repeat:no-repeat;/* 左绝对定位 */position: absolute;top: 0;left:0;}.container>.right{width:100px;min-height: 200px;background-color: wheat;background-image:url('right.png') ;background-repeat:no-repeat;/* 右绝对定位 */position: absolute;top: 0;right:0;}.container>.main{width: 860px;background-color: limegreen;min-height: 200px;background:url('main.png') no-repeat ;/* 主体绝对定位 */position: absolute;left:90px;top:0;}</style></head><body><!-- 页眉 --><div class="header">页眉</div></div><!-- 主体 --><div class="container"><div class="left">左侧</div><div class="main">主体</div><div class="right">右侧</div></div><!-- 页脚 --><div class="footer">页脚</div></body></html>}.container>.right{width:100px;min-height: 200px;background-color: wheat;background-image:url('right.png') ;background-repeat:no-repeat;/* 右绝对定位 */position: absolute;top: 0;right:0;}.container>.main{width: 860px;background-color: limegreen;min-height: 200px;background:url('main.png') no-repeat ;/* 主体绝对定位 */position: absolute;left:90px;top:0;}</style>

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>中国诗词大会:浮动定位完成三列布局</title><style>/* 初始化 */* {margin:0;padding:0;box-sizing: border-box;color:red;font-size: 1.2rem;}/* 页眉样式 与内容 */.header{width: 1060px;height: 500px;margin:auto;background:url('header.png') no-repeat center;}/* 页脚样式 与内容*/.footer{width: 1060px;height: 130px;margin:auto;background:lightgreen url('footer.png') no-repeat center ;}/* 主体样式 */.container{width: 1060px;margin: 10px auto;background-color: #ccc;min-height:200px;/* 转为定位元素,作为定位父级*/position: relative;}.container>.left{width:85px;min-height: 200px;/* 左浮动 */float: left;background: wheat url('left.png') no-repeat;}.container>.right{width:100px;min-height: 200px;/* 右浮动 */float: right;background: wheat url('right.png') no-repeat;}.container>.main{width: 800px;min-height: 200px;margin-left:40px;background:limegreen url('main.png') no-repeat ;/* 左浮动 */float: left;}</style></head><body><!-- 页眉 --><div class="header">页眉</div></div><!-- 主体 --><div class="container"><div class="left">左侧</div><div class="main">主体</div><div class="right">右侧</div></div><!-- 页脚 --><div class="footer">页脚</div></body></html>
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