css使用border画三角形_html/css_WEB-ITnose
前端中的很多地方都会用到三角形，比如tooltip等
CSS中创建三角形的方法很多，可以参考这里：
CSS创建三角形（小三角）的几种方法
比较简单实用的还是使用border来创建三角形，今天主要研究这个的实现
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