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<!DOCTYPE html> <html> <head> <style> h1 { border-left-style: outset; border-left-color: coral; border-left-width: 7px; } div { border-style: solid; border-left-style: outset; border-left-color: coral; border-left-width: 7px; } </style> </head> <body> <h1>带有外部左边框的标题</h1> <div> 带有外部左边框的 div 元素。</div> </body> </html>