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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 25px 50px 75px; background-color: lightblue; } </style> </head> <body> <h2>margin 简写属性 - 3 个值</h2> <div>这个div元素的上边距为25px，左右边距为50px，下边距为75px。</div> <hr> </body> </html>