MYYA
<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta charset="utf-8" /> <title>Tab Style</title> <style> p {width:112px;height:32px;float:left;position:relative;overflow:hidden;} p:before {content:'';background:#9f9f9f;width:32px;height:32px;transform:rotate(-45deg);position:absolute;left:6px;border-radius:2px;} p:after {content:'';background:#9f9f9f;width:96px;height:32px;position:absolute;right:0;border-radius:3px;} p > i {width:8px;height:8px;background:#fff;border-radius:50%;position:absolute;top:50%;margin-top:-4px;left:8px;} </style></head><body> <p><i></i></p></body></html>update 2017.02.07有同学在问圆点透明的问题,如果仔细阅读style就能发现原点是由i标签来呈现的,只要将i标签的背景色改成rgba就可以达到目的。p > i {width:8px;height:8px;background:rgba(255,255,255,.3);border-radius:50%;position:absolute;top:50%;margin-top:-4px;left:8px;}