css学习笔记（2） Reset CSS，clearfix

一，Reset CSS

目的：减少各种浏览器下默认样式的差异。 

方法：

1. 使用Reset CSS清除浏览器默认样式，网上有很多写好的Reset CSS模板，选一个适合自己网页要求的，复制黏贴。
2. 写一个适合自己的Base CSS

/* =====================RESET CSS=====================*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

/* ========================================== */

参考链接：http://meyerweb.com/eric/tools/css/reset/index.html； 

http://apps.hi.baidu.com/share/detail/16981702

二，clearfix（清除浮动）

     css中有个头疼的东西：布局。 使用float可能会带出很多排版上的错误，这时就可以利用clearfix来清除多余的float影响。

 解决办法：

1. 在css文件中复制黏贴以下clearfix代码；

/* ========================= clearfix =============================== */
/* http://www.yuiblog.com/blog/2010/09/27/clearfix-reloaded-overflowhidden-demystified */

.clearfix:before,
.clearfix:after{
	content: '.';
	display: block;
	overflow: hidden;
	visibility: hidden;
	font-size: 0;
	line-height: 0;
	width: 0;
	height: 0;
}

.clearfix:after{
	clear: both;
}

/*
	The following zoom:1 rule is specifically for IE6 + IE7.
	Move to separate stylesheet if invalid CSS is a problem.
*/

.clearfix{
	zoom: 1;
}

2.   在使用float：left 或者 float：right的HTML标签上调用clearfix

<div id="wraper" class="clearfix">

参考链接：http://www.cnblogs.com/zllwebjs/archive/2010/03/19/1689980.html