《CSS3实战》笔记--渐变设计（三)_经验交流
IE浏览器引擎的CSS渐变实现方法
IE并不支持CSS渐变，但是提供了渐变滤镜，可以用来实现简单的渐变效果。
基本语法
该参数的参数说明如下：
enabled:设置或检索滤镜是否激活。可选布尔值，包括 true 和 false，默认值为 true ，表示激活状态。
startColor ：设置或检索色彩渐变的开始颜色和透明度。可选项，其格式为#AARRGGBB。AA，RR，GG，BB为十六进制正整数，取值范围为00~FF。RR指定红色值，GG指定绿色值，BB指定蓝色值，AA指定透明度，00是完全透明，FF是完全不透明。超出取值范围的值将被恢复为默认值。取值范围为#FF0000~#FFFFFF，默认值为#FF0000FF，即不透明蓝色。
EndColorStr : 设置或检索色彩渐变的结束颜色和透明度。默认值为#FF000000，即不透明黑色。
IE 渐变滤镜实战应用
利用IE滤镜设计渐变背景，然后通过背景图像设计图文插画效果。
代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>IE浏览器引擎的CSS渐变实现方法</title>
<style type="text/css">
body {
padding:1em;/让渐变背景填充整个页面/
margin:0;
text-align:center;
/*为网页设计垂直渐变背景*/
filter: progid:DXImageTransform.Microsoft.Gradient(gradientType=0, startColorStr=#9999FF, endColorStr=#ffffff);
}
h1 {/*标题样式*/
color:white;
font-size:18px;
height:45px;
line-height:65px;/*控制文本显示位置*/
/*以绝地定位方式实现块元素居中显示*/
position:absolute;
left:50%;
margin-left:-150px;
padding-left:50px;
border-bottom:solid 2px #c72223;
/*为标题插入一个装饰图标*/
background:url(images/icon4.png) no-repeat left center;
}
ul {/*列表框样式*/
/*清除列表默认样式*/
list-style-type:none;
margin:90px 0 0 0;
padding:0;
background:url(images/bg6.png) no-repeat right bottom;/*设计插图背景*/
clear:both;
text-align:left;/*恢复默认对齐方式*/
}
li {
line-height:1.5em;
margin:6px auto;
/*为列表项设计个性化的列表图标*/
font-size:14px;
background:url(images/icon3.png) no-repeat left 3px;
padding-left:20px;
}
</style>
</head>
<body>
<h1 id="喜欢是一种心情-爱是一种感受">喜欢是一种心情，爱是一种感受</h1>
<ul>
<li>有一种爱叫痴缠，比如很多人对张国荣的,有时候这样真的挺好，没有比爱一个故人更安全和永恒的了。</li>
<li>有一种爱叫迷恋，某一时间里，忽然发现自己迷上某个人或某种感觉，但那不会长久。有时候迷恋会转化成爱。</li>
<li>爱里面一定有迷恋、有喜欢。可迷恋、喜欢都不是爱。</li>
<li>当自己终于明白什么是爱的时候，往往生命去了大半。人生路上能遇上一个真正爱自己的人，是机缘。</li>
<li>有时候，爱是一瞬间的感觉，爱并不能长久保留，如果两人经营得好才会长久保留下去。爱同时是脆弱的，爱会破碎。</li>
<li>有时候，爱是一种心愿，一种可以让自己与对方更快乐的心情。一份美好的爱必定离不开包容。</li>
<li>有时候，爱是一种自然。花开花落，云卷云舒的一点没有强求。</li>
<li>当能够以一种平淡的心情看待感情时，爱便变得隽永。</li>
<li>爱情有时候让人变得很苛刻，但后来又会很包容。当爱对方超过爱自己，那爱就会很包容。</li>
<li>喜欢一个人不会对他很苛刻，因为喜欢不会有更多的要求。相反爱却是苛刻的。</li>
<li>喜欢一个人不会为她很心痛，爱却往往是很心痛。爱是一种归属，喜欢没有归属。</li>
<li>在喜欢与爱的边缘徘徊的人，如果尝试着离开很远，还能在某个深夜静静地想起他，想到心痛与流泪，那一定是爱了。</li>
<li>在爱上之前可能有很长的喜欢，有时喜欢就能转化成爱，有时喜欢也会淡掉。原来人与人都是平行线上的一些点，檫肩而过很平常，向左转，向右转，下一个路口，还会有新的风景。</li>
<li>有时候喜欢会带来遗憾，但爱情会带来伤害。这种伤害最后会变成对对方一生的祝福。但喜欢就会越来越淡，最后在心里留下一个淡漠的影子。爱比喜欢要有力量。</li>
</ul>
</body>
</html>演示效果：
W3C标准化的CSS渐变实现方法
25个渐变背景网页设计案例欣赏
标准草案沿袭Gecko引擎的渐变设计方法：http://dev.w3.org/csswg/css3-images/#gradients
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