文字阴影
text-shadow: 水平偏移 垂直偏移 模糊 颜色
兼容性：IE10+
<!DOCTYPE html>
<html lang="en" manifest="index.manifest">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
p{
color:blue;
text-shadow: 3px 3px 3px black;
}</style>
</head>
<body>
<p>这是一段测试文本鸭</p>
</body>
</html>
css3 换行
word-break: normal | break-all | keep-all
对于英文文本：normal 和 keep-all 效果相同；break-all 即字母和字母见换行，不考虑单词的影响
对于中文文本：normal 和 break-all 效果相同；keep-all 即根据标点符号换行
<!DOCTYPE html>
<html lang="en" manifest="index.manifest">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
p{width:500px;}
span{background:#abcdef;}
p:nth-child(1){word-break:normal;}
p:nth-child(2){word-break:break-all;}
p:nth-child(3){word-break:keep-all;} p:nth-child(5){word-break:normal;}
p:nth-child(6){word-break:break-all;}
p:nth-child(7){word-break:keep-all;}
</style>
</head>
<body>
<p><span>[word-break:normal]</span> I have a dream that one day on the red hills of Georgia, the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.</p>
<p><span>[word-break:break-all]</span> I have a dream that one day on the red hills of Georgia, the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.</p>
<p><span>[word-break:keep-all]</span> I have a dream that one day on the red hills of Georgia, the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.</p>
<hr>
<p><span>[word-break:normal]</span> 我梦想有一天，这个国家会站立起来，真正实现其信条的真谛：“我们认为人人生而平等的真理不言而喻。”我梦想有一天，在佐治亚的红山上，从前奴隶的后嗣将能够和奴隶主的后嗣坐在一起，共叙兄弟情谊。</p>
<p><span>[word-break:break-all]</span> 我梦想有一天，这个国家会站立起来，真正实现其信条的真谛：“我们认为人人生而平等的真理不言而喻。”我梦想有一天，在佐治亚的红山上，从前奴隶的后嗣将能够和奴隶主的后嗣坐在一起，共叙兄弟情谊。.</p>
