CSS属性问题高手请进解释，想知道设置这些属性对网页有什么好处？
BODY {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: 0px; PADDING-RIGHT: 0px; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-SIZE: 100%; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px
}
H1 {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: 0px; PADDING-RIGHT: 0px; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-SIZE: 100%; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px
}
H2 {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: 0px; PADDING-RIGHT: 0px; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-SIZE: 100%; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px
}
H3 {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: 0px; PADDING-RIGHT: 0px; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-SIZE: 100%; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px
}
H4 {
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: 0px; PADDING-RIGHT: 0px; BACKGROUND: none transparent scroll repeat 0% 0%; FONT-SIZE: 100%; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px
}
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这么写好臃肿。。。
其实就是初始化，标签的padding,marign.还有border都为0
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学习css吧 其实就是基础 只是大写了不好看
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一般会合并写成BODY,H1,H2,H3,H4{...}
或者直接 *{...}
用于浏览器的兼容性，消除默认属性的差异
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