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<!DOCTYPE html> <html> <head> <style> div.ex1 { margin: 20px; border: 1px solid black; outline: 4px solid red; outline-offset: 15px; } div.ex2 { margin: 10px; border: 1px solid black; outline: 5px dashed blue; outline-offset: 5px; } </style> </head> <body> <h1>outline-offset 属性</h1> <div class="ex1">这个 div 在边框边缘外 15 像素处有一个 4 像素的实心红色轮廓。</div> <br> <div class="ex2">这个 div 有一个 5 像素的虚线蓝色轮廓，在边框边缘外 5 像素。</div> </body> </html>