《css秘籍》-第七章-上（margin、padding）_html/css_WEB-ITnose
- padding是指与其边框线之间的空间
- border是指盒子周边的直线
- background-color是用来填充边框内部空间的
- margin是指一个标签和另外一个标签之间的间隔。
默认是这样的，但是由于不同的浏览器会给相同的标签提供不同的padding和margin，因此最好将所有标签的padding和margin都置零
用margin和padding控制空间
padding是在内容和边框之间增加空间，padding占用的空间也可以为空白内容，但他仍然会填满背景色或者图片，margin则是在元素之间增加空白，所有有时候看到增加margin之后，会多了空白的沟槽。
margin可以用百分比进行布置，例如
< !DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"/> <title></title> <style> .test1{ margin-left: 20%; margin-right: 20%; width: 500px; height: 500px; border: solid; } </style></head><body><div class="test1"></div></body></html>假设这个div就是在html的body的一个div，这样的话这个div会始终保持增加距离浏览器左边%20的间距和距离浏览器右边%20的间距。这种做法很适合在做一些适配浏览器尺寸的操作。
margin和padding可以使用快捷属性：
例如
margin: 0 10px 20px 30px;
这个配置的参数从左到右是，上边，右边，下边，左边的margin。
快捷方式很方便设置4个方向的值。
边距冲突
当元素的margin-bottom碰到另外一个元素的margin-top的时候，浏览器并不是将他们相加，而是应用他们中较大的一个。这时候就会很奇怪，所以应该使用padding-top或者padding-bottom。
margin负值
margin的正值是增加元素之间的空间，而负值是移除他们之间的空间。所以通过设置margin的负值可以很简单的将元素移动到想要的位置。
未经允许不得转载：神一样的少年 » 《css秘籍》-第七章-上（margin、padding）
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