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<!DOCTYPE html> <html> <head> <style> h1 { border-top-style: outset; border-top-color: coral; border-top-width: 7px; } div { border-style: solid; border-top-style: outset; border-top-color: coral; border-top-width: 7px; } </style> </head> <body> <h1>带有顶部外边框的标题</h1> <div> 一个带有外边框的 div 元素。</div> </body> </html>