2019独角兽企业重金招聘Python工程师标准>>> 
css3中text-align:center:justify;
这个属性是单词两端对齐的意思。
值justify可以使文本的两端对齐。在两端对齐的文本中，文本行的左右两端都放在父元素的内边界上。然后，调整单词和字符间的间隔，使各行的长度恰好相等。
举例：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>css中display:justify</title>
<style>
.box1{ width:500px; line-height:20px; margin:10px auto; background-color:#cdd; text-align:justify;}
.box2{ width:500px; line-height:20px; margin:10px auto; background-color:#cdd; text-align:left;}
</style>
</head>
<body>
<div>There is clearly a need for CSS to be taken seriously by graphic artists. The Zen Garden aims to excite, inspire, and encourage participation. To begin, view some of the existing designs in the list. Clicking on any one will load the style sheet into this very page. The code remains the same, the only thing that has changed is the external .css file. Yes, really</div>
<div>There is clearly a need for CSS to be taken seriously by graphic artists. The Zen Garden aims to excite, inspire, and encourage participation. To begin, view some of the existing designs in the list. Clicking on any one will load the style sheet into this very page. The code remains the same, the only thing that has changed is the external .css file. Yes, really</div>
</body>
</html>效果图：
css3伪元素 ---------- ::selection
定义和用法
::selection 选择器匹配被用户选取的选取是部分。
::selection{
background:#f00;
color:#00f;
}
::-moz-selection{
background:#f00;
color:#00f;
}该伪元素只能设置两个属性background和color，设置其他属性不起作用。
兼容的浏览器：
::selection在IE家族中，只有IE9+版本支持，在Firefox中需要加上其前缀“-moz”