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<!DOCTYPE html> <html> <head> <style> #example1 { border: 2px solid red; padding: 10px; border-top-right-radius: 25px; } #example2 { border: 2px solid red; padding: 10px; border-top-right-radius: 50px 20px; } </style> </head> <body> <h2>border-top-right-radius: 25px:</h2> <div id="example1"> <p>border-top-right-radius 属性定义右上角的半径。</p> </div> <h2>border-top-right-radius: 50px 20px:</h2> <div id="example2"> <p>如果设置了两个值； 第一个用于上边框，第二个用于右边框。</p> </div> </body> </html>