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<!DOCTYPE html> <html> <head> <style> h2 { outline-style: double; } div.a { outline-style: double; } div.b { border: 1px solid red; outline-style: double; } </style> </head> <body> <h1>outline-style 属性</h1> <h2>双轮廓标题</h2> <div class="a">具有双轮廓的 div 元素。</div> <br> <div class="b">注意轮廓在任何边框之外。</div> </body> </html>