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<!DOCTYPE html> <html> <head> <style> p.normal { border: 2px solid red; } p.round1 { border: 2px solid red; border-radius: 5px; } p.round2 { border: 2px solid red; border-radius: 8px; } p.round3 { border: 2px solid red; border-radius: 12px; } </style> </head> <body> <h2>border-radius 属性</h2> <p>此属性用于为元素添加圆角边框：</p> <p class="normal">正常边框</p> <p class="round1">圆形边框</p> <p class="round 2">圆角边框</p> <p class="round 3">圆形边框</p> </body> </html>