首先,先来看一个简单的例子:
测试一
HTML代码:
1 <div style="background-color: gray;">测试一</div>
我们现在给上面的例子中,CSS添加float属性,你会发现一些小小的变动,也许你认为这没什么,今天要讲的主题就是由这个小小的变化衍生而来的;
测试二
HTML代码:
1 <div style="background-color: gray; float: left;">测试二</div>
你现在可以看到:测试二中的DIV是随着你内容的增加自动伸缩的。啊,yes...把这个效果应用到背景阴影里会出现什么效果呢?
1、不用给包裹的DIV设置固定宽度了
2、能根据图片的大小自动调整
摘处:CSS Mastery
![Dunstan Orchard](https://images.cnblogs.com/cnblogs_com/kidi/193546/r_dunstan.jpg)
CSS代码:
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.img-wrapper {
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background: url(images/shadow.gif) no-repeat bottom right;
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clear: both;
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float: left;
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position: relative;
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margin: 10px 0 0 10px;
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}
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.img-wrapper img {
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background-color: #fff;
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border: 1px solid #a9a9a9;
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padding: 4px;
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display: block;
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margin: -5px 5px 5px -5px;
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position: relative;
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}
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
HTML代码:
1 <div class="img-wrapper"><img src="images/dunstan.jpg" width="300" height="300" alt="Dunstan Orchard" /></div>
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