CSS框模型( Box Model)规定了元素框处理元素的内容 内边距 边框 和 外边距的方式
CSS框模型概述
可以用下面的模型图概述
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" alt="" />
元素框的最内部分是实际的内容 直接包围内容的是内边距 内边距呈现了元素的背景 内边距的边缘是边框。边框以外是外边距，外边距默认是透明的，因此 不会遮挡其后的任何元素。
提示：背景应用于由内容和内边距 边框组成的区域。
内边距 和 外边距都是可以选的 默认值是0 但是许多元素将由用户代理样式表设置外边距和内边距 可以通过将元素的margin 和 padding 设置为零来覆盖这些浏览器的样式 这可以分别进行 也可以使用通用选择器对所有的元素进行设置。
*{
padding:0;
margin:0;
}
在CSS中 width 和 height 指的是内容区域的宽度和高度。增加内边距 边框 和 外边距 不会影响内容区域的尺寸。但是会增加元素框的总尺寸。
假设框的每个边上有10个像素的外边距和5个像素的内边距 如果希望这个元素框达到00个像素 就需要将内容的宽度设置为70像素。如下图所示。
#box {
width: 70px;
margin: 10px;
padding: 5px;
}
提示：内边距、边框和外边距可以应用于一个元素的所有边，也可以应用于单独的边。
提示：外边距可以是负值，而且在很多情况下都要使用负值的外边距。
CSS内边距
元素的内边距在边框和内容区之间。控制该区域最简单的属性就是padding属性
CSS padding属性定义元素边框与元素内容之间的空白区域。
CSS padding 属性
CSS padding 属性定义元素的内边距 padding属性接受长度值或者 百分比 但不允许出现负值
例如 你希望所有h1元素的各边都有10像素的内边距 只需要这样
h1 {padding: 10px;}
你还可以按照 上 右 下 左的顺序分别设置各边的内边距 各边均可以使用不同的单位或百分比值：
h1 {padding: 10px 0.25em 2ex 20%;}
单边内边距属性：
也可以通过使用下面四个单独的属性 分别设置上 右 下 左 内边距：
padding-top //上内边距
padding-right //右边的内边距
padding-bottom//下边的内边距
padding-left// 左边的内边距
内边距的百分比数值
百分比数值是相对于其父元素的width计算的 这一点与外边距一样 所以 如果父元素的width改变 他们也会跟着改变。
CSS内边距实例：
1:所有内边距属性在一个声明中
<html>
<head>
<meta charset="UTF-8">
<title>链接</title>
<style type="text/css">
table td.text1 {
padding: 1.5em;
}
table td.test2 {
padding: 0.5em 2.5em;
}
</style>
</head>
<body>
<table border="1">
<tr>
<td class="text1">这个表格单元的每个边拥有相等的内边距</td>
</tr>
</table> <table border="1">
<tr>
<td class="test2">这个单元格的上和下边距是0.5em 左右边距是2.5em</td>
</tr>
</table>
</body>
</html>
如果想要保持一个盒子的占有宽度不变，那么加width就要减padding 加padding就要减width
padding的区域有背景颜色 也就是说background-color 将填充所有board以内的区域