W3School TIY Editor
W3School 在线教程
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暗黑模式
运行代码
<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> </head> <body> <p>one</p> <div><p>two</p></div> <p>three</p> <script>$("div > p").css("border", "1px solid gray");</script> </body> </html>