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<!DOCTYPE html> <html> <head> <style> div.a { position: relative; width: 400px; height: 200px; border: 3px solid red; } div.b { position: absolute; left: -10px; width: 100px; height: 120px; border: 3px solid blue; } div.c { position: absolute; left: 150px; width: 200px; height: 120px; border: 3px solid green; } </style> </head> <body> <h1>left 属性</h1> <div class="a">这个 div 元素有 position: relative; <div class="b">这个 div 元素有 position: absolute 和 left: -10px</div> </div> <div class="c">这个 div 元素没有父元素，position: absolute，位于文档正文左边缘右侧 150 像素处。</div> </body> </html>