W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <head> <style> div { border:2px solid; padding:10px; background:#dddddd; border-top-left-radius:2em; -webkit-border-top-left-radius:2em; /* Safari */ } </style> </head> <body> <div>border-top-left-radius 属性允许您向左上角添加圆角边框。</div> </body> </html>
查看结果: