<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><h1>border-radius 属性</h1><p>此属性用于为元素添加圆角：</p><p class="normal">普通边框</p><p class="round1">圆角边框</p><p class="round2">角更圆的边框</p><p class="round3">角最圆的边框</p></body></html>