题解 | CSS选择器——伪元素
CSS选择器——伪元素
https://www.nowcoder.com/practice/b647425a1b464aff825a45d2b1825638
{"html":"<!DOCTYPE html>\n<html>\n\n<head>\n <meta charset=\"UTF-8\">\n <style>\n /* 填写样式 */\n div:after{\n content:'';\n display:block;\n width:20px;\n height:20px;\n background:rgb(255, 0, 0)\n }\n </style>\n</head>\n\n<body>\n <div></div> \n <script type=\"text/javascript\">\n /* 填写JavaScript */\n \n </script>\n</body>\n\n</html>","css":"","js":""}
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